System: andriod 4.4 or above and ios 8.0 or above Battery: li-pol 80mah Bluetooth: bt4.0 Language: 16 countries Screen: 0.66 inch oled Operation: sigle touch Function:blood pressure, heart rate, blood oxygen, step pedometer, calories mode , distance track, sleep monitoring, incoming call/message reminder(wechat, whatsapp, facebook, twitter, qq..Ect), timer mode, clock mode, anti-lost, camera remote control Bracelet:50mm*24mm*11.6mm Strap material: silica gel Waterproof grade: ip65 Language:english(other language can be customized) Control type:button control, app control Standy time: 10-15days Charing time: 20-30mins Net weight: 22g Package Smart bracelet*1, strap*1 usb charging line*1, user manual