Xiaomi Youpin New Smart Ring Ring Bluetooth Black Technology Heart Rate Blood Oxygen Sleep Monitoring Waterproof Ring

Latest Tech Gadget for Smartphones - TiMER 2 Waterproof NFC Technology Smart Ring - Comes in Black or White Sizes 7-12 White 8 : : Electronics

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

CALANDIS® NFC Multifunctional Intelligent Ring Smart Finger Digital Ring US8 Black, Metal

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Xiaomi Youpin New Smart Ring Ring Bluetooth Black Technology Heart Rate Blood Oxygen Sleep Monitoring Waterproof Ring

T89 Pro 1.14 inch TFT Color Screen Bluetooth Earphone Smart Bracelet, Support Sleep Monitoring / Blood Oxygen Monitoring / Heart Rate Monitoring( Black)

1. Material: metal+plastic+silicone, 2. Battery capacity: 270mAh, 3. Life time: 14 days, 4. Charging port: magnetic pin charging port, 5. Bluetooth