This lightweight smart ring helps you snooze so you don't lose - Yanko Design

Sleep Quality Detector: This bluetooth connection smart ring can detect your sleep time, patterns, and quality, helping you improve your sleep

Luqeeg Health Tracker Smart Ring, Bluetooth Connection Health Fitness Tracker, IPX8 Waterproof Rechargeable Smart Ring Heart Rate Body Temperature

Magic Smart Ring, Depth Waterproof Universal Wearable Smart Ring, NFC Smart Ring for Mobile Phone Usage, No Charging Required (size8) : Electronics

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This lightweight smart ring helps you snooze so you don't lose - Yanko Design

Smart Ring, Waterproof Ceramic Ring, Universal Wearable BT Connection Health Tracker for Mobile Phone, Sports Ring with Heart Rate Monitor, Sleep Monitor, Temperature, Blood Oxygen (Black No. 17) : Everything Else

Bewinner Smart Ring - Ideal Gift, Intelligent Sleep Monitor, Multifunctional Health Care Sports Ring with Wireless Charging Box, Stylish & Practical Black (NO 22) : Sports & Outdoors

Ring - Yanko Design

Luqeeg Health Tracker Smart Ring, Bluetooth Connection Health Fitness Tracker, IPX8 Waterproof Rechargeable Smart Ring Heart Rate Body Temperature Pedometer for Heart Rate Sleep Monitor (17#) : Sports & Outdoors