Sleep Wearable Form Factor
Compare smart rings, fitness bands, and smartwatches for overnight sleep tracking: comfort, battery habits, and sleep metric depth.
RENPHO R-MZW01 Black Size 8 Lynx Smart Ring
Available offers (5)
Current
Black Size 8
Retailer
€177.09
Available to order
Features
- All-day sleep & activity tracking
- 7-12 day battery life
- Charging case for extended use
- 5ATM water resistance
- Subscription-free app
- Heart rate and SpO2 monitoring
- Titanium alloy construction
- HSA/FSA eligible
General specs
- Brand: RENPHO
- Model: R-MZW01
- Seller: Retailer
- ID: B0DKXBFLDC
- Brand: RENPHO
- Width: 0.71 inches
- Height: 0.12 inches
- Length: 0.71 inches
- Weight: 0.0881849048 pounds
- Sensors: Sophisticated chip and sensor
- Charging: Charging case included
- Material: Titanium
- Ring Size: 8
- Battery Life: 7 days
- Subscription: Subscription-free
- Compatibility: iOS, Android
- FSA/HSA Eligible: Yes
- Water Resistance: 5ATM
- App Compatibility: Renpho Health App, Apple Health, Google Health Connect
- Tracking Features: Sleep, Blood oxygen, Stress, Heart rate, Steps, Distance, Calories burned, Walking, Running
- First listed by seller: June 28, 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
Don't guess your sleep. Get data that helps you wake up refreshed. The RENPHO LYNX Smart Ring is for anyone who wants to understand their nighttime recovery and daily activity without wearing a bulky watch or paying a monthly fee. Track your sleep stages, heart rate, blood oxygen, and stress levels automatically, and see a Health Index score each morning.
Use the free Renpho Health App—no subscription needed. Sync with Apple Health or Google Health Connect. The ring runs 7–12 days on a charge, and the included charging case adds another week, so it's ready when you travel. It's 5ATM waterproof, so you can swim or wash hands without removing it. The titanium exterior is tough enough for 24/7 wear.
Before ordering, use the official RENPHO sizing kit to get the right fit. Sizing differs from standard rings. Wear the ring with the sensor facing your palm for accurate readings. Remove it before applying lotion to prevent slipping.
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| Brand | RENPHO | Oura | Anarow | Domhong | Kuxlagz | SEEKZERO |
| Model | R-MZW01 | JZ90-54217-08 | R10M | R03 | ||
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| Price | €177.09 | €310.58 | €71.18 | €31.85 | €62.28 | €62.28 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Retailer |
| Update | May 15, 2026 | Jun 24, 2026 | Apr 7, 2026 | Mar 21, 2026 | Mar 21, 2026 | Mar 21, 2026 |
| Weight | 0.0881849048 pounds | 0.011464037624 lbs | 1.0 | |||
| Battery Life | 7 days | 5-8 days | 5–7 d | |||
| Water Resistance | 5ATM | Yes | 5ATM | |||
| Size | 8 | 10 | 9 | |||
RENPHO R-MZW01 Black All-day sleep & activity tracking
€177.09
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