Product Dimension 260 x 44.5 x 9.8 mm mm mm (Total length and case diameter and thickness) Colour Black,Silver,Gold casesand leather/silicon/Steel optionals Net weight 55g BTversion 5.0 BLE Calling BT version 3.0 BLE Waterproof level IP67 Chipset RTL8762DTandJL Acceleration sensor SC7A20 Optical Heart rate sensor HRS3605 ,Optical Heart Rate Sensor ModuleandTrue Oxygen Display screen Type:1.32 'inch round Colorful display Touch screen:Full touch control Resolution:360 x 360 px Battery Type: Polymer lithium battery Battery capacity: 270 mA Charging time: about 60 minutes Working hours: 5-7 days Standby time: about 40 days Material Plastics and Metal/Silicon optional Working temperature -20C - 50C Vibration motor Support Heart rate chip Support Motor Built-in, vibration reminder The main function Receive/Reject phone calls/ Dial phone call Heart rate monitoring Blood/Blood oxygen pressure monitoring Sleep monitoring Sedentary reminder Sports pedometer/calorie consumption/track record/exercise time Call reminder and display Message is pushed and displayed Remote control camera Automatically heart rate measurement Multi-Sport measurement Clock reminder Alarm reminder Dial 4 kinds of dials default. APP customized watch faces are optional Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.