1. simple operation，without install
   2. GSM/AGPS tracker，all global GSM network can be use
   3. the door was opened/closed， will send SMS and call you.
   4. Active listening
   5. voice trigger call back
   6. Remote battery check
   7. Low battery remind
   8. all funtion can be remote star /stop
   9. GSM network 850/900/1800/1900MHZ
   10. size:45*34*14mm weight:29g