Product Description: Bluetooth Version:Bluetooth 4.0 Transmission Range:Transmission Range Screen Type:0.96 inch TFT Color Touch Screen Screen Resolution:80 *160px Sensor:RT3000 PPG Shipset:EM7028 Waterproof:IP67 Level Professional Waterproof Total Length:235mm Band Width:22mm Main Unit Size:4.1cm*1.2cm*1.9cm(Length x Height x Width) Bracelet material:ABS main body cover PC strap TPUBattery Capacity: 105mAh Polymer Lithium Battery Charging Time:about 1 ~ 2 Hours Working Time:5 to 10 days ( specific using time depends on frequency of using and frequency of push contenct ) Standby Time:Up to 30 days Virbation:Loundspeaker Mute / Vibration Package Include: 1 x Smart Bracelet 1 x Charger 1 x User Manual Notes: 1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors. 2. Due to the screen difference the color may be a little difference from what you expect please allow it.