Hardware parameters: CPU:RK8762C Display screen :1.54'' 240*240 touch screen:Touch ALL+button Configuration parameter :RAM:160kB+ROM:384kB+FLASH:128Mb+Main frequencyï¼?40M Bluetooth :BLE 5.0 Heart rate sensor:VC31 battery:200Mah large capacity polymer batteries G-SENSOR:STK8321 Charging:contact magnetic charg System support:Android 4.4the above IOS 8.0 the above support Bluetooth4.0 Appearance parameters Colour:black blue Pink white green Material Body: PC+ABS strap: Silica gel Machine size:44.3*37.9*10MM Strap size :180mm-225mm Machine weight:37g waterproof level:IP67 Package Size:149.5mm*96.5mm*34mm Package weight:123g Carton size:34cm*18cm*50cm certified product:CE RoHS MSDS quality inspection report appearance patent