B7 Bluetooth Earphone Smart Bracelet, Support Sleep Monitoring / Blood Oxygen Monitoring / Heart Rate Monitoring(Silver + Silver Steel Chain) woman denim jeans mso-para-margin-bottom:

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Keeping the batteries of these connected devices is not always easy

Cover opening mode: Zipper

Two USB ports: two integrated USB ports

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B7 Bluetooth Earphone Smart Bracelet, Support Sleep Monitoring / Blood Oxygen Monitoring / Heart Rate Monitoring(Silver + Silver Steel Chain) woman denim jeans mso-para-margin-bottom:1. Bluetooth version: 5. 0 2. Talk time: about 6 8 hours 3. Standby time: about 3 4 days 4. Battery capacity: Built in 90mAh 5. Charging method: Type C input 6. Charging time: about 1 2 hours 7. Waterproof level: life waterproof 8. Hidden earphone design, pick up to answer and put in to hang up 9. Blood pressure and oxygen monitoring anytime, anywhere, to accurately grasp your health status 10. The caller's name and number are clear at a glance, so