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♥As a primary resources provider and a responsible seller,JIAMEIYI will not sell any low end products,this heart rate bracelet/smart wristband/hearts rate monitor/smart watch is definitely one of the most trustworthy fitness tracking product you are worth to own.JIAMEIYI upgraded fitness tracker helps you know more about yourself by tracking your movements and care your health day and night. Specification: App name: Wearfit Vibrate: Mute/ vibrate Contection: Bluetooth 4.0 BLE Battery: Polymer lithium battery Size: L*W*H= 51.3*23.8*13.1 Strap size: L*W = 17.0*10 Screen size:0.49Inch Screen type:OLED display Material:Alloy Battery :60mH Polymer lithium battery Vibration:Mute/vibration Water-proof level:IP67,(DO NOT steep in the hot water for long time) Data Sync:data synchronization to mobile app Data storage:Storage 7 days' sports data APP compatible language:English Compatibility:Support phones android based and IOS based,android 4.4 and above,IOS 8.0 and above,with BT 4.0 . Charging type: 2 Points charging Charging time: About 1.5 hour Standby time: Normal use: 3-5days; Standby: 7 days Package Included: 1 x Smart Wristband 1x USB cable 1 x User Manual Note: Our blood pressure monitor is only for reference to provide blood pressure before and after sports, not for medical use and is not suitable for patient hypertension. Bracelet has degree of IP67 waterproof protection, but we do not recommend using it when swimming and diving