Huawei Talkband B5 Brand: HUAWEI Compatible: Device\'system must be Android 4.4/ iOS 9.0 OS or above and Bluetooth 4.2 or above. Bluetooth: 4.2 Screen: * 1.13 inch * Type: AMOLED * Pixel: 300×160 * Color Screen * Touch screen * 2.5D glass screen * 316L stainless steel frame Battery:108mAh (polymer lithium battery) Charging port: Micro USB Theoretical working time: about 3.5 days ( when turn off sleep mode); about 3 days ( when turn on sleep mode). *above data is only for reference, working time may be different when using method is different. Theoretical call time: about 6 hours Theoretical charging time: about 2 hours ROM: 16MB Flash ( external ), 1MB Flash( built in) RAM: 512KB Microphone: Double noise reduction microphone Waterproof: IP57 **Please do not wear it to shower,swimming, diving,scuba diving. Sensor: acceleration sensor gyroscope heart rate sensor Hall Sensor Function: * Bluetooth conversation * Listening music through Bluetooth earphone * Dial a call * Caller name show/Receive a call quitely ( only compatible with phone which OS is EMUI 4.1 or above) * Call records * TruSleep * 24 hours heart rate monitoring * Activity record * Sport Monitoring ( walk, run, cycling etc.) * Sport target set * Message remider * Sedentariness remind * O\'clock * Looking for phone Strap Width:18mm Strap material: Friendly silicon ( for sport version) Genuine leather ( for businiess version) Size: 58.2mm×23.3mm×12.9mm ( not include strap) Earphone: 44.1mm×20.0mm×11.9mm Button: Press 2 buttons at the same time, earphone can be popup; 1 side button, support long-press, short-press, double click. SYSTEM REQUIREMENTS: Android 4.4 and above ; IOS 9.0 and above