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Ring vs Tracker
Compare screen-free rings with wrist fitness trackers for sleep comfort, workout feedback, sizing, battery life, and when a smartwatch is the fallback.
RENPHO R-MZW01 Black Size 8 Lynx Smart Ring
Available Options
Current
Black Size 8
Amazon
€145.50
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
Product details
General specs
- Brand: RENPHO
- Model: R-MZW01
- Material: Titanium
- Battery Life: 7 days
- Subscription: None
- Charging Case: Included
- Compatibility: iOS, Android
- Eligible Hsa/Fsa: Yes
- Water Resistance: 5ATM
If you are interested in more details, you can find full information on the seller's page.
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Top live offer
€145.50
Free shipping
New
Third-party seller
FBA
Shippable
Offers updated: 8/31/26
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Price History for seller Amazon
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.
RENPHO R-MZW01 Black All-day sleep & activity tracking
€145.50
Affiliate link. As an Amazon Associate I earn from qualifying purchases.
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