Call from your wrist: Make and receive calls with its built-in speaker with Nano SIM (Mini) card inserted in?? Independent standby?? supports 2G GSM 850/900/1800/1900?? 3G WCDMA 900/2100.</br>Retina display with Force Touch; 3 interface changes as you like?? Scratch-proof?? Shatterproof?? High hardness?? Wear resistance?? Water resistant in rain?? sweat and splash?? IP54 Life Waterproof?? not suitable for swimming or diving.</br>Your smart life helper: activity trackin" monitor?? sleep tracking?? Pedometer?? Sedentary remind?? Browser?? Music?? Alarm clock?? Sound recorder?? messages?? schedules?? meeting reminders?? stopwatch?? timer?? voice search?? GPS navigation?? phone call remind?? message remind?? remote camera?? remote music?? find the phone?? weather.</br>Compatible Android Phone: Samsung?? Huawei?? HTC?? LG?? Sony?? Android Tablet PC?? Nexus. With Bluetooth connecting between watch and phone?? It can get phone call remind?? message remind?? remote camera?? remote music?? find the phone. Operating System: Android 5.1 OS (not for IOS).</br>Touch Screen and Multimedia Social function not only for fitness?? suburban travel?? Camping?? exploration?? Mountain climbing but also for more wonderful life</br></br>Product Description</br></br><b>Product Feature</b><br> <b>Sync network</b>2G:GSM(850/900/1800/1900)?? 3G:WCDMA(900/2100)??AT&T and Tmobile.<br> <b>Software</b> Download and Install "nual on your phone and connect smart watch with Bluetooth. Not support Android Wear APP or IOS. <br> <b>Storage</b> RAM 512MB+ ROM 8GB (6GB free using memory?? ignore software occupied)?? Not support SD/TF card.<br> <b>Bluetooth pairing</b> 1??Turn on your cellphone Bluetooth and keep it on. 2?? Turn on your watch Bluetooth?? search your cellphone. The Bluetooth icon in status bar turns in green when pairing succeeds. <br> <b>Work on Android phone</b> With Bluetooth connecting?? every function supported by Bluetooth from your phone can work on watch.<br> <b>Strap </b> Food grade silica gel?? unchangeable. <br> <b>Music /Talk Time</b> 2hours/3 hours<br> <b>Standby Time</b> 24 hours?? but shorter if you have much phone calls?? music play etc. Turn off Bluetooth to be longer <br><br> <b>Specification</b><br> <b> CPU:</b> MTK6580?? 1.3GHZ Quad core<br> <b> Memory:</b> 512MB?? ROM: 8GB<br> <b>Touch screen:</b> 1.39