Amazon.com: CENAP Smart Ring, Sleep and Fitness Ring with App, Support iOS and Android, 24/7 Activity Monitoring and 2 Size Optional, Magnetic Fast Charging and Sleek, for Sleep Tracking, Pedometer : Sports
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Amazon.com: CENAP Fitness Smart Ring, Sleep Tracker Ring with Special APP and G-Sensor, Magnetic Charging, Waterproof and Energy Saving, for Monitoring Health, Body Temperature, Sleeping and Heartbeat, Fitness : Sports & Outdoors