SR08 Digital Display Smart Ring – BT 5.1, IP68, Heart Rate, Sleep, Blood Oxygen
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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 SR08 is a smart ring with digital display in stainless steel with glue filling process construction. Bluetooth: 5.1. Waterproof rating: IP68. Chipset: Dialog DA14585. G-sensor: SC7A20. Heart rate sensor: HX3918. Memory: 128KB ROM, 96KB RAM. Ring battery: 16mAh. Battery life: approximately 3–4 days normal use, approximately 16–20 days standby. Charge time: approximately 2 hours via magnetic charging cable. Sizes: #8 (18.2mm inner diameter) through #12 (21.5mm). Thickness: 2.5mm. Operating temperature: not specified in source. App: Jring. GPS: app-based (mobile phone GPS). Digital display: touch the side button to show time, steps, heart rate, SpO2, sleep data, and battery level. Health tracking: sleep, blood oxygen, heart rate, multi-sport modes. Certifications: CE, CE-RoHS. Colour: not specified by name in source (ColorStyle I). Package: ring and magnetic charging cable and English user manual. No charging case included. Curated by Aetheo.
Why you'll like it
- Digital display — touch side button to view time, steps, heart rate, SpO2, sleep, and battery
- Heart rate, blood oxygen, sleep, and multi-sport tracking via Jring app
- IP68 waterproof — stainless steel, 2.5mm thick, approximately 3–4 days battery
- Bluetooth 5.1 — DA14585 chipset with HX3918 heart rate sensor
- CE and CE-RoHS certified
Designed for health tracking with on-ring data display
The SR08 includes a digital display that shows key data directly on the ring without requiring the paired phone — pressing the side touch button cycles through time, steps, heart rate, SpO2, sleep data, and battery level on the ring's display. The Jring app provides the full health data history and reporting interface via Bluetooth 5.1. The HX3918 optical sensor monitors heart rate and blood oxygen saturation continuously during wear. Sleep tracking and multi-sport mode recording are also supported. GPS function uses the paired phone's GPS — the ring does not contain a built-in GPS module. The SR08 is waterproofed to IP68 and is constructed from stainless steel with a glue filling process. Ring thickness is 2.5mm; sizes are available from #8 through #12. The 16mAh battery provides approximately 3–4 days of normal use or approximately 16–20 days of standby; charge time is approximately 2 hours via the included magnetic charging cable. No charging case is included — the ring charges directly via magnetic cable. Certifications: CE and CE-RoHS. Curated by Aetheo.
Key features
Digital display — time, steps, heart rate, SpO2, sleep, battery on-ring
The SR08 features an on-ring digital display, activated by pressing the side touch button. The display cycles through: current time, step count, heart rate reading, SpO2 (blood oxygen saturation) reading, sleep data, and battery level — providing at-a-glance data without opening the Jring app or reaching for the phone. Display brightness and cycling control are managed via the side button; refer to the user manual for the full button operation sequence. The Jring app provides historical data, trends, and detailed reports for all tracked metrics.
Heart rate, blood oxygen, sleep, and multi-sport tracking via Jring app
The HX3918 optical sensor monitors heart rate and blood oxygen saturation (SpO2) continuously during wear. Sleep tracking records sleep patterns for display and analysis in the Jring app. Multi-sport mode records exercise activity data — specific sport types supported are not detailed in source documentation. GPS is app-based — the ring uses the paired phone's GPS rather than a built-in GPS module. All health monitoring data is displayed through the Jring app; the ring records and transmits sensor data. Health tracking features record and display data; they do not diagnose, treat, or replace medical devices or professional medical advice.
BT 5.1 — IP68 — stainless steel — magnetic charging cable
Bluetooth 5.1 connects the SR08 to paired smartphones for data sync and Jring app communication. The IP68 waterproof rating makes the ring suitable for wear during water exposure. The stainless steel body uses a glue filling process for construction. Ring thickness is 2.5mm; sizes available are #8 through #12. The Dialog DA14585 chipset provides the processing and wireless communication functions with 128KB ROM and 96KB RAM. The 16mAh battery provides approximately 3–4 days of normal use or approximately 16–20 days of standby. Charging takes approximately 2 hours via the included magnetic charging cable — no charging case is included in the package; the ring charges directly from the magnetic cable.
Best for
- On-ring digital display — view time, steps, heart rate, SpO2, sleep, battery without the app
- Heart rate, SpO2, and sleep tracking — multi-sport modes via Jring app
- IP68 waterproof daily wear — stainless steel, 2.5mm thick, size
Frequently asked questions
How long does the battery last?
Approximately 3–4 days with normal use, or 16–20 days in standby mode.
Is the SR08 waterproof?
Yes, it has an IP68 rating, making it suitable for swimming and water sports.
What metrics does it track?
It monitors heart rate, blood oxygen saturation (SpO2), sleep, and includes multi-sport tracking modes via the Jring app.
How do I charge it?
Via the included magnetic charging cable, taking approximately 2 hours for a full charge.
| Specification | Details |
|---|---|
| Model | SR08 |
| Material | Stainless steel with glue filling process |
| Bluetooth Version | 5.1 |
| Chipset | Dialog DA14585 |
| G-Sensor | SC7A20 |
| Heart Rate Sensor | HX3918 |
| Memory | 128KB ROM + 96KB RAM |
| Ring Battery | 16mAh |
| Battery Life (normal use) | Approx. 3–4 days |
| Battery Life (standby) | Approx. 16–20 days |
| Charge Time | Approx. 2 hours (magnetic charging cable) |
| Thickness | 2.5mm |
| Sizes | #8 (18.2mm) – #12 (21.5mm) inner diameter |
| Waterproof Rating | IP68 |
| Companion App | Jring |
| GPS | App-based (phone GPS) |
| Digital Display | Time, steps, heart rate, SpO2, sleep, battery (side touch button) |
| Health Tracking | Sleep, blood oxygen (SpO2), heart rate, multi-sport modes |
| Colour | Not specified in source (ColorStyle I) |
| Certifications | CE, CE-RoHS |
| Included | Ring, magnetic charging cable, English user manual (no charging case) |
A Closer Look
See it in the everyday