R03 Smart Ring 5ATM BT 5.0 – Heart Rate, SpO2, Sleep, QRing App
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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 R03 is a 5ATM waterproof smart ring in stainless steel with Bluetooth 5.0 (BLE). Chipset: RF03. Accelerometer: STK8321 (Sitronix). Heart rate sensor: VC30F (Vcare). Memory: RAM 208KB, FLASH 512KB. Ring battery: 15mAh lithium polymer. Charging case battery: 200mAh. Charging time: approximately 1 hour. Usage: 5–7 days. Standby: 15 days. Sizes: #7 (17.9mm) to #12 (21.6mm). App: QRing. GPS: not supported. Compatibility: Android 5.1 and above, iOS 8.0 and above. Certifications: CE, CE-RoHS. Curated by Aetheo.
Why you'll like it
- 5ATM waterproof — suitable for swimming and water activity
- 15mAh ring battery — 5–7 days of use, 15 days standby
- Tracks heart rate, blood pressure, blood oxygen, and sleep
- Multiple sport modes — activity, steps, distance, and calories
- 30+ languages supported — Android 5.1+ and iOS 8.0+ compatibility
Designed for health monitoring across active and everyday wear
The R03 uses the VC30F heart rate sensor and STK8321 accelerometer to record health and activity data through the QRing app on Android 5.1 and above or iOS 8.0 and above. The 5ATM waterproof rating allows for swimming and sustained water exposure without removal. With 5–7 days of active battery life and a 200mAh charging case, the ring stays powered through extended wear. Curated by Aetheo.
Key features
Heart rate, blood pressure, blood oxygen, and sleep tracking
The VC30F optical heart rate sensor records heart rate, blood pressure, and blood oxygen saturation (SpO2). Sleep tracking records sleep stages and duration automatically. Step count, distance, and calorie data are logged alongside health metrics. This device tracks and records data — it does not diagnose, treat, or replace medical advice.
Multiple sport modes and photo capture
The QRing app supports multiple sport modes for exercise recording. Remote photo capture is supported — the ring acts as a shutter trigger for the paired phone camera. GPS is not supported in the ring or via app-based location — the R03 does not have GPS capability of any kind.
5ATM waterproofing — stainless steel construction
The 5ATM water resistance rating is higher than standard IP68, allowing for swimming and prolonged water exposure. The stainless steel ring body is suitable for active and outdoor use.
15mAh ring — 200mAh charging case — approximately 5–7 days
The 15mAh ring battery provides approximately 5–7 days of active use or 15 days on standby. The ring recharges from the 200mAh charging case in approximately 1 hour. The QRing app is compatible with Android 5.1 and above and iOS 8.0 and above, supporting over 30 languages including English, Simplified Chinese, Traditional Chinese, German, French, Italian, Spanish, Portuguese, Polish, Russian, Ukrainian, Japanese, Korean, Arabic, and more.
Best for
- Heart rate, blood pressure, SpO2, and sleep monitoring
- 5ATM waterproof wear — suitable for swimming
- 5–7 day battery with 200mAh charging case
- Sport mode tracking — steps, distance, calories, photo capture
- 30+ language support — Android 5.1+ / iOS 8.0+ with QRing app
What's included
- 1 × R03 Smart Ring
- 1 × Charging Cable
- 1 × Charging Case (200mAh)
- 1 × English User Manual
Compatibility and setup
Material: stainless steel. Bluetooth: 5.0 BLE. Waterproof: 5ATM. Chipset: RF03. Accelerometer: STK8321. HR sensor: VC30F. Memory: RAM 208KB, FLASH 512KB. Ring battery: 15mAh lithium polymer. Case battery: 200mAh. Charging: approx. 1H. Usage: approx. 5–7 days. Standby: approx. 15 days. Sizes: #7 (17.9mm) to #12 (21.6mm). App: QRing. GPS: not supported. Compatible: Android 5.1+ / iOS 8.0+. Languages: 30+. Certifications: CE, CE-RoHS.
Why choose the R03 smart ring?
The R03 is a Bluetooth 5.0 smart ring in stainless steel — 5ATM waterproof, RF03 chipset, VC30F HR sensor, STK8321 accelerometer, RAM 208KB / FLASH 512KB, 15mAh ring, 200mAh case, approx. 5–7 day battery, 15 day standby, heart rate, blood pressure, SpO2, sleep, steps, sport modes. GPS: not supported. Sizes #7–#12. CE, CE-RoHS certified. QRing app. Android 5.1+ / iOS 8.0+. 30+ languages. Curated by Aetheo.
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FAQs
How long does the R03 smart ring battery last?
The R03 has a 15mAh ring battery providing approximately 5–7 days of active use or 15 days on standby. The ring charges from the included 200mAh charging case in approximately 1 hour.
| Specification | Details |
|---|---|
| Model | R03 |
| Material | Stainless steel |
| Waterproof | 5ATM |
| Bluetooth | 5.0 BLE |
| Chipset | RF03 |
| Accelerometer | Sitronix STK8321 |
| Heart Rate Sensor | Vcare VC30F |
| Memory | RAM 208KB, FLASH 512KB |
| Ring Battery | 15mAh lithium polymer |
| Case Battery | 200mAh |
| Charging Time | Approx. 1 hour (from case) |
| Usage Time | Approx. 5–7 days |
| Standby Time | Approx. 15 days |
| Ring Sizes | #7 (17.9mm), #8 (18.3mm), #9 (19.2mm), #10 (20.0mm), #11 (20.9mm), #12 (21.6mm) |
| App | QRing |
| GPS | Not supported |
| Health Tracking | Heart rate, blood pressure, SpO2, sleep, steps, distance, calories, sport modes, photo capture |
| Compatibility | Android 5.1 and above, iOS 8.0 and above |
| Languages | 30+ (including English, German, French, Spanish, Japanese, Arabic, Korean, and more) |
| Certifications | CE, CE-RoHS |
| Included | Smart ring, charging cable, charging case (200mAh), English user manual |