Material: Steel + silicon. 1.48″ capacitive touch scree TFT LCD. Dial size: 4.6 x 4.2 x 1 cm/1.81 x 1.65 x 0.39 inch. Sync phone book/SMS/call history (only for android phone). Altitude meter, passometer, photograph, barometer, vibration. Stopwatch function: Remote taking photo function: You can control your cellphone to take photo from your wrist. Ring reminder when your android 2.3 or above smart phone receive a message (including WeChat, Facebook, Twitter, WhatsApp ,Skype and so on). Anti-lost alarm function: When cellphone left watch alarm automatically, after a certain distance to avoid lose the phones. Note: Android system can support all functions mentioned in the description, but IOS only support passometer, calendar, call sync, calculator, clock, stopwatch.