lumthou R18 Smart Ring: No subscription fee
For the active professional who juggles work, workouts, and wellness, this smart ring offers a discreet way to track your health without a subscription fee. It’s perfect for monitoring your sleep patterns after a stressful day or keeping tabs on your heart rate during a morning run.
Beyond typical fitness tracking, this ring serves as a subtle wellness companion. The 24/7 heart rate and SpO2 monitoring provide insights into how your daily habits affect your energy levels, helping you spot trends for better recovery. The feather-light enamel design feels comfortable enough for all-day wear, so you can focus on your goals without distraction.
Practical features like remote camera control make it easy to capture group photos hands-free, while the IP68 waterproof rating means it stays on during swims or sweaty sessions. With up to 7 days of battery life, you get reliable tracking that fits seamlessly into your routine.
Features
- Sleep tracking with stages analysis
- Heart rate and SpO2 monitoring
- IP68 waterproof for swimming
- Remote camera control
- 8+ sports modes tracking
- Long battery life up to 7 days
- Feather-light comfort at 0.007-0.009 lbs
- Multi-language app support
- Stress management insights
- No subscription fee
General specs
- Brand: lumthou
- Model: R18
- Seller: Amazon
- ID: B0FP2TS524
- Size: 9
- Weight: 0.11
- Battery Life: 5-7 d
- Charging Time: 1.5
- Charging Method: Magnetic
- Water Resistance: IP68
- First listed by seller: 11/9/25
If you are interested in more details, you can find full information on the seller's page.
Buy on Amazon
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Shipping options
United States
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| Brand | lumthou | UniJethro | YULUCKGO | SSPATIOS | Freeze2Trim | Ultrahuman |
| Model | R18 | SR11M | BJ02 | 786368975579 | ours ring sizing kit | AIR |
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| Price | $89.99 | $39.99 | $19.88 | $55.99 | $39.99 | $399.00 |
| Seller | Amazon | Amazon | Amazon | Amazon | Amazon | Amazon |
| Update | December 6, 2025 | December 6, 2025 | December 6, 2025 | June 27, 2025 | December 6, 2025 | July 19, 2025 |
| Size | 9 | 9 | 8 | 7 | ||
| Weight | 0.11 | 100 | 5.39 | |||