Kudolo Smart Watch for Kids GPS Tracker for Kids SOS Call, GPS LBS Double Location, Monitor Wearable Smart Locator for Android Iphone (Blue) Portable GPS tracker for kids with GPS +LBS real-time tracking, phone options, monitoring, E-railing and more that make parents keep track of their kids easily and precisely. One-touch SOS Alarm: Long press SOS button for five seconds, an emergency call will dial out and SOS SMS will be sent out for emergency help. Compatible with Android 2.2 system, IOS 6.0 system above, support Micro SIM CARD(SIM and Nano-SIM card is not included). Safety and Low Radiation: Environmetally friendly material with 90% lower radiation compared with smart phone, protect kids eyesight and skin perfectly. 300mAh lithium battery, stand about 60 hours. Long life battery.