Signstek Smartwatch Supports Quad-Band GSM Bluetooth Cell Phone, Music and Video Multimedia Player, FM radio, Camera, Sync calls to iPhones, Android Phones, Bluetooth Phones, Comes with 8GB Micro-SD Memory Card Built-in phone functions:it has built-in SIM card slot, can use as a normal mobile phoneit has built-in 1.3M camera Smart Bluetooth connect Iphone and Android phone, then can answer calling and read SMS by the watch directly. Note: Support WATER RESIST, but can not wrist it when swimming or bathing; 450mAh Li-ion battery, standby time 3 days, talking time 3 hours Sync phonebook, calls and SMS between watch and Iphone/Android phone 1.54" Ipod Nano touch screen and TFT display screen, 240*240 pixel high resolution it has built-in 1.3M camera Supprot Iphone/Ipad/Android samrt phone Watch will alarm you if your mobile phone was stole or leaving you out of 15 meters