Mini GPS Tracker Watch For Kids SOS Emergency Anti Lost GSM Smart Mobile Phone App Bracelet Wristband Alarm (Green) Support Pedometer, Radio Controlled, GPS, Sleep Monitor, Anti-Lost,SIM card,Terminal SOS emergency alarm,Low-battery alarm, Watch-removal alarm compatible with IOS 6.0 or latest. Android system 2.3 or latest When children encounter risks, press SOS button for emergncy help Know where the children are at anytime by usinng GPS 420mAh lithium battery,stand about 2-3 days. Long battery life