
Size Chart
MPS Smart Ring
Find Your Perfect Size
Measure the circumference of your finger to determine your size. If you are between two sizes, we recommend the larger option for all-day comfort.
| Ring Size | Inner Diameter (mm) | Circumference (mm) |
|---|---|---|
| # 7 | 17.5 mm | 57.5 mm |
| # 8 | 18.3 mm | 60.0 mm |
| # 9 | 19.1 mm | 62.8 mm |
| # 10 | 20.0 mm | 65.4 mm |
| # 11 | 20.8 mm | 67.8 mm |
| # 12 | 21.6 mm | 70.4 mm |
| # 13 | 22.4 mm | 72.4 mm |
How to measure your finger
1
Step 1 — Preparation
Take a long, non-stretch strip of paper or a thin string.
2
Step 2 — Wrap
Wrap the strip snugly around your finger — not too loose, not too tight.
3
Step 3 — Mark
Mark the exact point where the strip overlaps itself.
4
Step 4 — Measure
Lay the strip flat and measure its length in mm. Compare the result with the table above.
Tip: It's best to measure in the evening when fingers are slightly thicker, and repeat the measurement 2-3 times for a more accurate result. If you are between two sizes, always choose the larger one. The MPS Smart Ring should fit snugly — secure for sports but easy to remove.
24/7 heart rate monitoring
Optimize your sleep
Waterproof up to 5 ATM
Activity recording
HOW WE COMPARE
MPS SMART RING
OURA
OTHERS
Sleep monitoring
Fundamental
All-day heart rate
Depending on the case
Water resistance
5ATM + IP68
Skin temperature
Activity Tracking
Monthly subscription
Price
€57
€300 + subscription
€30 to €70
Technical data
Scope of delivery
- MPS Smart Ring
- Magnetic charging cable
- User manual
Sensors
- Optical heart rate sensor – continuous 24/7 monitoring
- Digital skin temperature sensor – records temperature trends
- Accelerometer – Activity and motion tracking
- Blood oxygen saturation (SpO₂)
Compatibility
- QRing app – available for iOS and Android
- Syncs with Apple Health
- Tracks steps, calories, distance, heart rate and sleep
- Supports over 35 languages
Battery life
- Longer battery life for multi-day use
- Magnetic charging cable included in the package
- Designed for continuous 24/7 use
Materials
- Titanium alloy case – inner and outer surfaces
- Advanced low-temperature potting technology
- Waterproof – 5 ATM and IP68 certified
- Durable for daily use and all activities
Connectivity
- Bluetooth Low Energy (BLE)
- Pairing with the QRing app via Bluetooth
- Integration with Apple Health
- Progress graphs and trend analyses in the app



