R12 5ATM Ceramic Smart Ring with Charging Case — Tracks Heart Rate
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Ring Sizing Guide
Example: UK size P is equivalent to US size 8. For a smart ring, order US size 9.
How to measure your finger
- Wrap a strip of paper or thin string around the base of your intended finger.
- Mark where it overlaps, then lay flat and measure the length in millimetres — this is your inner circumference.
- Find your UK size in the table below, read across to your standard US size, then order the smart ring size in the final column.
Measure in the evening when fingers tend to be at their largest. Your dominant hand is usually half a size larger than your other hand.
UK to US conversion — smart ring order sizes
| UK Size | US Size | Circumference | Smart Ring — Order |
|---|---|---|---|
| J | 5¼ | 45.3 mm | US 6 |
| K | 5½ | 46.0 mm | US 6 |
| L | 6 | 46.8 mm | US 7 |
| M | 6½ | 47.5 mm | US 7 |
| N | 7 | 48.3 mm | US 8 |
| O | 7½ | 49.0 mm | US 8 |
| P | 8 | 49.8 mm | US 9 |
| Q | 8½ | 50.5 mm | US 9 |
| R | 8¾ | 51.3 mm | US 9 |
| S | 9½ | 52.8 mm | US 10 |
| T | 9¾ | 53.5 mm | US 10 |
| U | 10¼ | 54.3 mm | US 11 |
| V | 10¾ | 55.0 mm | US 11 |
| W | 11¼ | 55.8 mm | US 12 |
| X | 11¾ | 56.5 mm | US 12 |
| Y | 12¼ | 57.3 mm | US 13 |
| Z | 12¾ | 58.0 mm | US 13 |
If you are between sizes, order the larger size — a slightly loose ring is easier to remove and more comfortable to wear throughout the day.
The R12 is a 5ATM-rated ceramic smart ring with an integrated charging case, designed for health tracking and everyday connectivity. Brand: not listed in the source specification. Certifications: CE-RED and CE-RoHS as listed in the source specification table. The ring is rated 5ATM for water resistance, making it suitable for swimming as stated in the source specification. Material: ceramic. The ring tracks heart rate, blood oxygen levels, temperature trends, and female physiological cycles as stated in the source specification. Sports modes include walking, running, cycling, and swimming, with records for heart rate, steps, distance, calories, and duration. The chip is RTL8762 ESF; Bluetooth: 5.2; heart rate sensor: Vcare VC30F-S; accelerometer: ST LIS2DOC. Battery: 14mAh (18mAh for size 10 and above); magnetic charging; approximately 1.5-hour charge time; 5–7 days use; 15 days standby. Supported features: 35 languages, gesture control, device locator, remote camera, ring games, and themes. Not supported: Bluetooth calling, Wi-Fi, NFC, GPS, display screen, encoder, gyroscope. Compatible with Android 5.1 and later; iOS 9.0 and later. Package: 1×Ring, 1×Charging Cable, 1×Charging Case, 1×English User Manual (English only — no Chinese manual). This device does not diagnose, treat, or replace medical advice. Curated by Aetheo.
Why you'll like it
- 5ATM-rated ceramic ring — 5ATM water resistance suitable for swimming as stated in source; ceramic material
- Health tracking — tracks heart rate, blood oxygen levels, temperature trends, and female physiological cycles; 5–7 days battery; 15 days standby
- Sports modes — walking, running, cycling, swimming; records heart rate, steps, distance, calories, and duration per session
- Gesture control, device locator, remote camera, ring games, and themes; 35 languages; BT 5.2; Android 5.1+ and iOS 9.0+
- R12; CE-RED and CE-RoHS certified; RTL8762 ESF chip; Vcare VC30F-S sensor; no Bluetooth calling, NFC, GPS, or screen; English manual only; charging case included
Designed as a ceramic smart ring for health tracking and everyday use
The R12 smart ring is a 5ATM-rated ceramic wearable designed for continuous health tracking and daily connectivity without the bulk of a smartwatch. The ceramic material provides hardness and a refined finish. The ring tracks heart rate and blood oxygen levels continuously, and records temperature trends and female physiological cycle data as stated in the source specification. Sports tracking covers walking, running, cycling, and swimming, with each session recording heart rate, steps, distance, calories burned, and duration. The RTL8762 ESF chip manages processing; the Vcare VC30F-S sensor handles heart rate and blood oxygen monitoring; the ST LIS2DOC accelerometer tracks movement. Bluetooth 5.2 connects the ring to the companion app on Android 5.1 and later or iOS 9.0 and later. The ring supports 35 languages, gesture control, device locator function, remote camera shutter, ring games, and customisable themes. Features not supported: Bluetooth calling, Wi-Fi, NFC, GPS, a display screen, encoder, and gyroscope. Battery: 14mAh standard (18mAh for size 10 and above); magnetic charging; approximately 1.5-hour charge time; 5–7 days in use; 15 days standby. The charging case is included. Certifications: CE-RED and CE-RoHS. User manual: English only. This device does not diagnose, treat, or replace medical advice. Curated by Aetheo.
Key features
5ATM water resistance — ceramic material — RTL8762 ESF chip — BT 5.2
The R12 is rated 5ATM for water resistance, making it suitable for use during swimming as stated in the source specification. Material: ceramic. The RTL8762 ESF chip manages ring operations. Bluetooth 5.2 provides connectivity to the companion app on Android 5.1 and later or iOS 9.0 and later. The Vcare VC30F-S sensor is used for heart rate and blood oxygen monitoring. The ST LIS2DOC accelerometer tracks physical movement for sports and activity data.
Health tracking — sports modes — gesture control and connectivity features
The ring tracks heart rate, blood oxygen levels, temperature trends, and female physiological cycle data continuously as stated in the source specification. Sports modes cover walking, running, cycling, and swimming; each session records heart rate, steps, distance, calories, and duration. Additional features include gesture control, a device locator function, remote camera shutter, ring games, and customisable themes. 35 languages are supported. Features not available: Bluetooth calling, Wi-Fi, NFC, GPS, a display screen, encoder, and gyroscope. This device does not diagnose, treat, or replace medical advice.
14mAh battery — 5–7 days — 15 days standby — magnetic charging — charging case included
Battery capacity is 14mAh standard (18mAh for size 10 and above) as stated in the
Frequently asked questions
Is this ring waterproof?
Yes. The R12 has a 5ATM water resistance rating and is suitable for swimming and water activities.
How long does the battery last?
Battery life is 5–7 days with normal use, or up to 15 days in standby mode. Charging takes approximately 1.5 hours.
What health metrics does it track?
The ring tracks heart rate, blood oxygen levels, temperature trends, and female physiological cycles across 35 languages.
Which phones does it work with?
Compatible with Android 5.1 or later and iOS 9.0 or later via Bluetooth 5.2.
| Specification | Details |
|---|---|
| Brand | Not listed in source specification |
| Model | R12 |
| Type | Ceramic smart ring with charging case |
| Water Resistance | 5ATM (swimming suitable as stated in source specification) |
| Material | Ceramic |
| Chip | RTL8762 ESF |
| Bluetooth | 5.2 |
| Sensor | Vcare VC30F-S (heart rate and blood oxygen); ST LIS2DOC (accelerometer) |
| Health Tracking | Heart rate, blood oxygen levels, temperature trends, female physiological cycles (does not diagnose, treat, or replace medical advice) |
| Sports Modes | Walking, running, cycling, swimming — records heart rate, steps, distance, calories, duration |
| Battery | 14mAh (18mAh size 10 and above); magnetic charging |
| Charge Time | Approximately 1.5 hours |
| Battery Life | 5–7 days use; 15 days standby |
| Features | Gesture control, device locator, remote camera, ring games, themes, 35 languages |
| Not Supported | Bluetooth calling, Wi-Fi, NFC, GPS, display screen, encoder, gyroscope |
| Compatible With | Android 5.1 and later; iOS 9.0 and later |
| Certifications | CE-RED, CE-RoHS |
| User Manual | English only (no Chinese manual) |
| Included | Ring, charging cable, charging case, English user manual |
A Closer Look
See it in the everyday