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The retimer ring is designed to give you a clear picture of how your body is doing — day and night. By tracking your sleep stages, heart rate, heart rate variability (HRV), skin temperature, and movement, it translates complex signals into simple insights about your sleep quality, recovery, stress levels, activity, and overall well-being. 

All of this syncs automatically to the retimer app, where you can see daily trends, spot long-term patterns, and receive AI-powered suggestions tailored to your lifestyle. Unlike basic step counters or fitness bands, the retimer ring combines multiple sensors with advanced AI models to build a deeper, more personal wellness profile. 

The more regularly you wear it — during sleep and daily routines — the more accurate and meaningful your insights become, helping you make small changes that add up to lasting improvements in energy, focus, and health. 

The retimer ring uses optical PPG sensors, temperature sensors, and motion sensors similar to those in high-end wearables. It is not a medical device, it is optimized for daily lifestyle tracking. 

Accuracy Factors: 

  • Wearing position & fit – Loose fit reduces PPG signal quality. 
  • Skin temperature & circulation – Cold fingers can reduce signal clarity. 
  • Motion artifacts – Heavy movement can temporarily distort readings. 
  • Consistent usage – More data improves AI calibration and accuracy. 

For most users, the retimer ring provides trends and patterns that closely align with consumer-grade medical-grade devices under typical conditions. 

Yes — the retimer ring is rated water-resistant and suitable for daily activities, including: 

  • Handwashing 
  • Showering 
  • Swimming (shallow water, up to 50 m) 
  • Sweat-heavy workouts 

Limitations: 

  • Not designed for high-pressure water (diving, hot tubs, power showers). 
  • Avoid wearing during contact sports that may damage the ring surface. 
  • After swimming in salt water or pools, rinse and dry the ring gently to maintain sensor clarity. 

No. The retimer Ring app is completely free to use, and access is included with your ring purchase. There are no hidden fees or ongoing subscription charges — once you own the ring, you can enjoy all the features and insights without extra cost. 

  • The ring stores data locally throughout the day and night. 
  • Data syncs automatically the next time your phone is nearby with Bluetooth enabled. 
  • The retimer ring can store up to 7 days of unsynced data, though the exact limit may vary for certain parameters depending on whether the data type is lighter or heavier. 
  • Wi-Fi is not required for the ring to collect and store data. 
  • Bluetooth is needed for syncing to the phone. 

Internet/Wi-Fi is only required for account setup, cloud backup, and AI-driven insights. 

The retimer ring comes with a compact charging case. The case connects using a USB-C cable, while the ring itself charges wirelessly when placed inside the case. 

On a full charge, the retimer ring typically lasts 4–7 days. Actual backup may vary depending on your usage (such as sleep tracking, continuous HR/HRV, and SpO₂ monitoring) and the ring size — larger sizes contain a bigger battery and generally provide longer runtime, while smaller sizes may last slightly less. 

Charging steps: 

  1. Place the ring in the charging case provided. 
  1. Connect the case to a USB power source (wall adapter or laptop). 
  1. Wait until the ring sensor light shows solid green, indicating full charge (≈ 60–90 minutes). 

Best Practices: 

  • Charge every few days during a short break (e.g., while showering) instead of waiting for the battery to drain completely. 
  • Avoid exposing the charging case or ring to extreme heat or water. 

Keep firmware updated via the app to maximize battery life. 

  • Place the ring in the charging case and connect to a USB power source. 
  • The sensor light will pulse to indicate charging. 
  • A solid green light means fully charged. 
  • If no light shows, check that the charging contacts are clean and the cable is properly connected. 
  1. Charge fully before first use – Place the ring in the charging case, connect to a USB power source, and wait until the ring sensor light turns solid green (charging takes ~60 minutes). 
  2. Download the retimer app – Available on both Google Play Store and Apple App Store and follow the steps further in the app screen. 

The ring stores data locally throughout the day and automatically syncs with the retimer app via Bluetooth when in range. 

  • Daily Sync: Open the app near your ring for automatic transfer. 
  • Offline Use: Data is stored in the ring for up to 7 days without syncing. After that, older data may overwrite. 
  • Internet Requirement: Internet is only required for account login, cloud backup, and AI-generated insights. Basic sync works offline. 
  • Keep Bluetooth enabled and open the app at least once per day to ensure seamless data transfer. 

Common troubleshooting steps: 

  1. Ensure Bluetooth is enabled on your phone. 
  1. Check that the ring has charge, sensors usually every 5 minutes 
  1. Restart the app and retry pairing. 
  1. Forget the ring from your phone’s Bluetooth settings and re-pair through the app. 
  1. Keep the ring within 10 cm (4 inches) of your phone during pairing. 

If issues persist: 

  • Update the app and firmware. 
  • Test with another phone (to isolate device-specific issues). 
  • Contact retimer support through the in-app help center. 

The retimer app is compatible with: 

  • iOS: iPhone 8 and newer, running iOS 15 or later. 
  • Android: Most major smartphones running Android 8 or later, with Bluetooth 5.0 support. 

Limitations: 

  • Tablets are not officially supported. 
  • Huawei devices without Google Services may face limited functionality. 
  • For best performance, keep your phone’s OS and the retimer app updated to the latest version. 
  • Updates are designed to improve performance without deleting your data. 
  • Data is stored both locally and, in the cloud, so updates do not erase history. 
  • Sync regularly to ensure your latest data is backed up before installing updates. 
  • Firmware updates are delivered through the retimer app. 
  • Place the ring in the charging case and keep it connected to power. 
  • Open the app and follow on-screen instructions for updates. 
  • Ensure Bluetooth and internet are enabled during the update. 
  • Do not remove the ring from the charging case until the update is completed. 
  • Open the retimer app and navigate to Device Settings → Reset Ring. 
  • Confirm reset — the ring will restore to factory settings. 
  • All data stored on the ring will be erased permanently. 
  • Your historical data remains safe in your retimer cloud account, but device-side logs will be cleared. 
  • After reset, you’ll need to re-pair the ring with your phone to continue using it. 

Your package includes: 

  • 1 × retimer ring (chosen size and color) 
  • 1 × charging case with USB-C cable 
  • 1 × quick start guide 

Duties, taxes, or handling fees will be reimbursed up to AUD 30 per unit, if applicable. 

  • Standard delivery takes 3–7 business days within your region. 
  • International shipping is available to most countries, with typical delivery times of 7–14 business days. 
  • Customs duties or import taxes may apply depending on your country’s regulations. 
  • Tracking information is provided once the order is shipped. 

Yes. The retimer ecosystem is built with privacy and security first: 

  • All health data is encrypted both on your device and in the cloud. 
  • Full compliance with GDPR data privacy regulations. 
  • You can download, delete, or export your data anytime via the app. 
  • No personal health data is sold to third parties. Aggregated, anonymized data may be used for product improvement. 

Always use the latest version of the app for the strongest security updates. 

  • Go to Account → Data & Privacy → Delete Account in the retimer app. 
  • Deleting your account permanently removes all cloud-stored data and deactivates your login. 
  • Once deleted, data cannot be recovered. 

The retimer ring includes a 1-year limited warranty covering: 

  • Manufacturing defects 
  • Hardware malfunctions under normal use 

Not Covered: 

  • Physical damage from misuse (scratches, exposure to extreme heat, etc.) 
  • Water damage beyond rated resistance 
  • Unauthorized modifications or repairs 
  • You can reach retimer customer support through the Get Support section in the app. 
  • For warranty claims, service requests, or replacement parts, you may be asked to provide your order details or device serial number. 
  • Download the retimer app on your new phone. 
  • Log in with the same account you used previously. 
  • All your historical data will sync automatically from the cloud. 
  • Pair your ring again through the app on the new device. 

retimer uses light therapy to change the timing of your internal body clock also known as your circadian rhythm.

Circadian rhythm, governed by the body’s internal clock, regulates our sleep-wake cycle and various physiological processes over a roughly 24-hour cycle. By exposing individuals to carefully calibrated light sources at specific times, light therapy can effectively treat conditions such as Seasonal Affective Disorder (SAD), circadian rhythm sleep disorders, and jet lag.

Depending on your needs, retimer can help you adjust your sleep or wake times.

retimer can be useful for people who:

  • Struggle to wake up in the morning
  • Have difficulty falling asleep
  • Wake up too early in the morning and cannot fall back asleep
  • Are permanent night shift workers
  • Experience jet lag
  • Suffer from the winter blues

The best time to wear retimer depends on what you are wanting to change about your sleep pattern. Generally, using retimer in the morning will make your sleep time and wake time earlier. On the other hand, using retimer at night will generally push your sleep and wake time later.

You can use our retimer mobile app to create a customized schedule that would work best for you.

The outcomes and time it takes to notice these outcomes will vary from person to person. Some people will notice small changes to their sleep and energy levels almost immediately after beginning to use retimer. Extensive research published in peer-reviewed scientific journals validates the efficacy of light therapy in modulating circadian timing, offering evidence-based support for its clinical application in various circadian rhythm-related disorders.
You may see small changes to your sleep and energy levels almost immediately when you start to use retimer. Moving your sleep or wake times is done incrementally though, and full results may take 1-2 weeks, depending on your desired outcome. You should be able to see the progress in the mobile app.

Most people will only need to use retimer once per day. This may be either in the morning or in the evening, depending on why they are using retimer. To find out your optimal time to use retimer for your desired outcome, use our sleep mobile app.

Using the device outside of the optimal time may be counterproductive. Regardless of when you use the device, it is typically recommended to use the device for 60 minutes or less in a 24-hour period.

Yes, in most cases you can read and work while you are using retimer.

retimer is designed to fit over reading glasses and corrective lenses, allowing you to read and work as usual. The light source from the device is soft, meaning it should not interfere with reading.

It is not recommended to wear retimer when driving, or doing tasks that would be unsafe to perform without your concentration, or could risk the device getting wet.

No, it is not safe to drive while using retimer. Driving requires your full concentration and the light of retimer may prevent you from concentrating fully on road hazards.

No, retimer glasses are not waterproof, and showering with them may damage the product.

Yes, retimer can be used outdoors in the absence of sunlight, however, there is no additional benefit in wearing retimer in the sunlight.
retimer mobile app is available in the google play store and apple store. It can be downloaded for free on your mobile/device.
retimer is used to help beat jet lag, keep shift workers alert, boost mood in people with the winter blues, and optimize their sleep patterns to suit their lifestyle.
The duration and time you wear retimer depends on the desired outcome. The retimer mobile app can be used to determine the schedule of use. In general, to fall asleep earlier at night morning use is recommended, and to delay the sleep time evening use is effective. retimer can be worn for upto an hour in the morning for an energy boost during the winter months.
The dominant wavelength used in retimer is 500nm which is blue-green in color. This has been chosen for both safety and efficacy in shifting the circadian rhythm. Our research studies have shown that green light is one of the most effective wavelengths for advancing or delaying the body clock. (Lack &Wright, 2001) Greenlight is also a safe wavelength to use and has been independently tested for ocular safety to the international standard. (CEI IEC 62471). Furthermore, the lenses of our eyes become cloudy and yellow as we age. This restricts blue light entering the eyes; therefore can be more effective.
retimer is charged using a USB cable. It will remain charged for at least 4 hours of use on a full charge. Once connected, the mobile app will display the available battery.
No, you should not use retimer while it is charging. Please see retimer Product Manual for information on charging the device prior to use.

retimer should not be used by children younger than 13 years of age. Check with your doctor before use if any of the following apply:

  • You have sensitivity to light (photosensitivity)
  • You have a skin condition that makes your skin especially sensitive to light
  • You are taking medication which may cause photosensitivity
  • You have or have had any eye conditions, such as, but not limited to glaucoma, retinal disorders, such as macular degeneration.
  • You have been diagnosed with Bipolar disorder

 
A small percentage of people may experience side effects when using Light Therapy, such as headache, dry mouth, eye strain, nausea and hyperactivity. These side effects can usually be resolved by discontinuing use of the device.

Yes. retimer has undergone independent ocular safety testing, and is also UV free.

These tests were performed by a separate third-party to confirm that the retimer device and light source is safe for the eyes.

The results of each individual will vary and depend on several factors. As a result, we cannot definitively guarantee that an individual’s body clock will be permanently adjusted. For some individuals this will be the case for others they may require intermittent use of retimer.

There are some additional things that you can do to help support your use of retimer:

  • Keep your bedroom dark at bedtime
  • Don’t consume excessive amounts of caffeine or alcohol in the evening
  • Use your bed for sleep only i.e., don’t work on your laptop
  • Try to go to bed and wake up at the same time each day

Light Therapy involves exposure to specific kinds of light (known as wavelengths) for a prescribed amount of time (up to 60 minutes a day) and at a specific time of day (morning or night). To find out your optimal time to use retimer for your desired outcome, use our retimer mobile app.

Light Therapy can help you change your sleep. When you are using retimer, the eyes detect the light, and your brain is signalled by your body to be awake and alert. This helps your body know when it is time to sleep, helping you maintain a consistent sleep-wake rhythm.

Light boxes and retimer have some similarities and some differences. Both use Light Therapy to help people with adjusting their circadian rhythms. When using a light box, the user sits in front of the box with the light shining indirectly towards their eyes. retimer is a glasses-type device worn on the face like regular glasses. Light boxes may be considered less portable than retimer due to their size and potential need for access to a power outlet (as opposed to the retimer rechargeable feature). The portable nature of retimer means that the device can be used in a wider variety of locations whereby it may not be possible to correctly set up a light box.

Duties, taxes, or handling fees will be reimbursed up to AUD 30 per unit, if applicable.

retimer doesn’t use any light in the ultraviolet or infrared spectrum, and the intensity of light delivered is lower than what one will experience outdoors in sunlight.
However, we recommend consulting with your physicians if you suffer from eye ailments like retinopathy, cataract, photosensitive disorders, etc. before using this product.

Although retimer does not produce the wavelengths that photosensitizing medications react to, we recommend that you avoid using any light therapy, and avoid excessive sunlight until you are no longer using photosensitizing medication.

Yes. Each retimer comes with a premium case for transportation.

Didn’t find your question? Don’t worry, you are always welcome to contact our support team.

retimer uses light therapy to change the timing of your internal body clock also known as your circadian rhythm.

Circadian rhythm, governed by the body’s internal clock, regulates our sleep-wake cycle and various physiological processes over a roughly 24-hour cycle. By exposing individuals to carefully calibrated light sources at specific times, light therapy can effectively treat conditions such as Seasonal Affective Disorder (SAD), circadian rhythm sleep disorders, and jet lag.

Depending on your needs, retimer can help you adjust your sleep or wake times.

retimer can be useful for people who:

  • Struggle to wake up in the morning
  • Have difficulty falling asleep
  • Wake up too early in the morning and cannot fall back asleep
  • Are permanent night shift workers
  • Experience jet lag
  • Suffer from the winter blues

The best time to wear retimer depends on what you are wanting to change about your sleep pattern. Generally, using retimer in the morning will make your sleep time and wake time earlier. On the other hand, using retimer at night will generally push your sleep and wake time later.

You can use our retimer mobile app to create a customized schedule that would work best for you.

The outcomes and time it takes to notice these outcomes will vary from person to person. Some people will notice small changes to their sleep and energy levels almost immediately after beginning to use retimer. Extensive research published in peer-reviewed scientific journals validates the efficacy of light therapy in modulating circadian timing, offering evidence-based support for its clinical application in various circadian rhythm-related disorders.
You may see small changes to your sleep and energy levels almost immediately when you start to use retimer. Moving your sleep or wake times is done incrementally though, and full results may take 1-2 weeks, depending on your desired outcome. You should be able to see the progress in the mobile app.

Most people will only need to use retimer once per day. This may be either in the morning or in the evening, depending on why they are using retimer. To find out your optimal time to use retimer for your desired outcome, use our sleep mobile app.

Using the device outside of the optimal time may be counterproductive. Regardless of when you use the device, it is typically recommended to use the device for 60 minutes or less in a 24-hour period.

Yes, in most cases you can read and work while you are using retimer.

retimer is designed to fit over reading glasses and corrective lenses, allowing you to read and work as usual. The light source from the device is soft, meaning it should not interfere with reading.

It is not recommended to wear retimer when driving, or doing tasks that would be unsafe to perform without your concentration, or could risk the device getting wet.

No, it is not safe to drive while using retimer. Driving requires your full concentration and the light of retimer may prevent you from concentrating fully on road hazards.

No, retimer glasses are not waterproof, and showering with them may damage the product.

Yes, retimer can be used outdoors in the absence of sunlight, however, there is no additional benefit in wearing retimer in the sunlight.
retimer mobile app is available in the google play store and apple store. It can be downloaded for free on your mobile/device.
retimer is used to help beat jet lag, keep shift workers alert, boost mood in people with the winter blues, and optimize their sleep patterns to suit their lifestyle.
The duration and time you wear retimer depends on the desired outcome. The retimer mobile app can be used to determine the schedule of use. In general, to fall asleep earlier at night morning use is recommended, and to delay the sleep time evening use is effective. retimer can be worn for upto an hour in the morning for an energy boost during the winter months.
The dominant wavelength used in retimer is 500nm which is blue-green in color. This has been chosen for both safety and efficacy in shifting the circadian rhythm. Our research studies have shown that green light is one of the most effective wavelengths for advancing or delaying the body clock. (Lack &Wright, 2001) Greenlight is also a safe wavelength to use and has been independently tested for ocular safety to the international standard. (CEI IEC 62471). Furthermore, the lenses of our eyes become cloudy and yellow as we age. This restricts blue light entering the eyes; therefore can be more effective.
retimer is charged using a USB cable. It will remain charged for at least 4 hours of use on a full charge. Once connected, the mobile app will display the available battery.
No, you should not use retimer while it is charging. Please see retimer Product Manual for information on charging the device prior to use.

retimer should not be used by children younger than 13 years of age. Check with your doctor before use if any of the following apply:

  • You have sensitivity to light (photosensitivity)
  • You have a skin condition that makes your skin especially sensitive to light
  • You are taking medication which may cause photosensitivity
  • You have or have had any eye conditions, such as, but not limited to glaucoma, retinal disorders, such as macular degeneration.
  • You have been diagnosed with Bipolar disorder

 
A small percentage of people may experience side effects when using Light Therapy, such as headache, dry mouth, eye strain, nausea and hyperactivity. These side effects can usually be resolved by discontinuing use of the device.

Yes. retimer has undergone independent ocular safety testing, and is also UV free.

These tests were performed by a separate third-party to confirm that the retimer device and light source is safe for the eyes.

The results of each individual will vary and depend on several factors. As a result, we cannot definitively guarantee that an individual’s body clock will be permanently adjusted. For some individuals this will be the case for others they may require intermittent use of retimer.

There are some additional things that you can do to help support your use of retimer:

  • Keep your bedroom dark at bedtime
  • Don’t consume excessive amounts of caffeine or alcohol in the evening
  • Use your bed for sleep only i.e., don’t work on your laptop
  • Try to go to bed and wake up at the same time each day

Light Therapy involves exposure to specific kinds of light (known as wavelengths) for a prescribed amount of time (up to 60 minutes a day) and at a specific time of day (morning or night). To find out your optimal time to use retimer for your desired outcome, use our retimer mobile app.

Light Therapy can help you change your sleep. When you are using retimer, the eyes detect the light, and your brain is signalled by your body to be awake and alert. This helps your body know when it is time to sleep, helping you maintain a consistent sleep-wake rhythm.

Light boxes and retimer have some similarities and some differences. Both use Light Therapy to help people with adjusting their circadian rhythms. When using a light box, the user sits in front of the box with the light shining indirectly towards their eyes. retimer is a glasses-type device worn on the face like regular glasses. Light boxes may be considered less portable than retimer due to their size and potential need for access to a power outlet (as opposed to the retimer rechargeable feature). The portable nature of retimer means that the device can be used in a wider variety of locations whereby it may not be possible to correctly set up a light box.

Duties, taxes, or handling fees will be reimbursed up to AUD 30 per unit, if applicable.

retimer doesn’t use any light in the ultraviolet or infrared spectrum, and the intensity of light delivered is lower than what one will experience outdoors in sunlight.
However, we recommend consulting with your physicians if you suffer from eye ailments like retinopathy, cataract, photosensitive disorders, etc. before using this product.

Although retimer does not produce the wavelengths that photosensitizing medications react to, we recommend that you avoid using any light therapy, and avoid excessive sunlight until you are no longer using photosensitizing medication.

Yes. Each retimer comes with a premium case for transportation.

Didn’t find your question? Don’t worry, you are always welcome to contact our support team.
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