1.GPS Position:   Parents can get message of GPS latitude and longitude data to find the child's position. 2.Defend Rail:   The unit will auto send a message to parents's phone if the unit is out of the safety area. 3.Safe Firewall:  All strangers' incoming calls & SMS will be auto rejected or blocked.  4.Restricted use in Class:  A restricted use can be done in class to avoid interruption. 5.SOS Emergence Calling:  Children just press the SOS key to call those pre-set 4 numbers for help.              6.Restriction for calling time:  Parents can set a time-limit for children to save money.         7.Ultra-low radiatioin: Average radiation is 1.3 wich is much lower than EU standard 2.0 8.Limit shut down, to shut down the phone need password