Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
Domhong R03 Black, Size 9 Smart Ring
Features
- Heart rate and blood oxygen monitoring
- No app subscription required
- 5ATM waterproof and IP68 rating
- Long battery life up to 7 days
- Multiple exercise modes tracking
- Remote control photography feature
General specs
- Brand: Domhong
- Model: R03
- Seller: Retailer
- ID: B0DZ2875TK
- Size: 9
- Battery Life: 5–7 d
- Water Resistance: 5ATM
- First listed by seller: June 6, 2025
If you are interested in more details, you can find full information on the seller's page.
Price History for seller Retailer
Shipping options
Delivery to 
United States
United States
Available
For the active individual who wants to track health without a bulky device, the Domhong Smart Ring offers a discreet way to monitor your fitness and wellness. While many wearables focus on alerts, this ring provides peace of mind through continuous, silent tracking—ideal for checking your stress levels during a busy workday or monitoring your heart rate during a morning run.
Its sensors capture subtle changes, like a slight dip in blood oxygen during sleep, giving you actionable insights to improve rest. With no app subscription, you keep full access to your data, and the long battery life means it works for days without interruption. Use the remote control to take photos effortlessly, making it perfect for capturing moments hands-free.
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Domhong R03 Black Heart rate and blood oxygen monitoring
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| Brand | Domhong | UniJethro | Rugsoul | UniJethro | Oura | Oura |
| Model | R03 | SR11M | SR11M | JZ90-54144-11 | JZ90-54217-10 | |
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| Price | €31.85 | €35.59 | €61.40 | €35.59 | €310.58 | €310.58 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | Mar 21, 2026 | Mar 21, 2026 | Mar 21, 2026 | May 29, 2026 | Mar 21, 2026 | Jun 24, 2026 |
| Size | 9 | 8 | 7# | 11 | 10 | |
| Battery Life | 5–7 d | 5-7 days | 5-7 days | 5 to 8 days | Up to 8 days | |
| Width | 0.31 inches | 0.31 inches | 1.1023622036 inches | 1.0629921249 inches | ||
| Height | 2 inches | 2 inches | 0.2755905509 inches | 0.2755905509 inches | ||
| Length | 2 inches | 2 inches | 1.1023622036 inches | 1.0629921249 inches | ||
| Number of Items | 1 | 1 | 1 | |||
Domhong R03 Black Heart rate and blood oxygen monitoring
€31.85
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