CELESTECH Y1S with Fitness Tracker, Camera, SIM Card and 32 GB Memory Card Slot,Smart Watch(Black Strap Free Size) HD display: High sensitive capacitive touch screen;perfect match technology, The Anti- lost function: Seek mobile phone,Tow-way anti lost;Entertainment: MP3,Camera;Sync function: QQ,wechat,Twitter,Facebook;time,schedule,read message or news;Sport health: Pedometer,sedentary remind,sleep monitoring, Phone function: Make phone call directly from the smart watch,including answering and dial-up.SIM slot,support make calls by Bluetooth or smart watch, GSM850/900/1800/1900 four frequency call function call, hands-free, phone records, phone book, Bluetooth phone. Bluetooth Protocol: A2DP + HFP 1.5 + HS P 1.2 Range of Frequency: 2.4GHz spectrum Ambient Noise: =75dB Transmitting Range: =10m Charging Time: about 1 hour Talk Time: about 3 hours Music Play Time: about 6 hours Standby Time: about 120 hours Power Supply: Built-in 320mAh rechargeable battery