Please refer to the instructions for use, suitable for all Bluetooth bracelets Step 1: Scan the QR code of the manual and download the APP Step two: turn on the phone's Bluetooth, turn on the bracelet Step 3: Connect the bracelet in the downloaded app. If you connect it on your phone's Bluetooth, this is not right Step 4: Charging method, remove the strap, the above is the USB connector, you can directly connect to the USB to charge Details Description: Product structure Product type Smart bracelet Size 258mm * 34.7mm * 11.3mm Weight 36.5g Display screen size 1.3inch Resolution 240 * 240 Capacity 180mAH Machine material Top cover Tempered glass Body Zinc alloy / bottom case ABS + PC Strap Silicone Hardware parameters Type Details Description CPU type Hs6620D Heart rate Normal heart rate EM7028 RAM (random memory) SRAM 128kb SFlash (Read Only Memory) Flash 1M G-sensor 3 axis Vibration motor shrapnel motor Bluetooth built-in BT antenna Charger interface Power contact Button touch single point Android system version 4.4 and above Apple system version 8.4 or later Software functions Type Details Description Software function Time display Support Step counting calories distance sport mode raising hand bright screen sleep monitoring Running track Call reminder Message reminder Sedentary reminder Alarm reminder etc