1. Supporting GSM 900/1800 MHz or 850/1900 Mhz; 2. Supporting call pre-setting Phone number, incoming call number display, SMS function 3. Big memory of phone book to store 200 phone number. 4. Supporting FM radio, flashlight, clock, external T-FLASH card functions. 5. Having base station location, electron fencing management function. 6. Supporting pre-setting centre number, APN, time zone function. 6. Fast signal capturing, data timing backup; 7. Supporting single positioning and continuous tracking; 8. Supporting low voltage alarming and voice monitoring function; 9. Supporting the location information inquiry by SMS and Internet 10. May monitor without disturbing the tracked person and realizes real-time tracking; 11. Can position the holder by call or mobile phone, SMS. 12. Press SOS key for help to service center and automatic call to monitoring mobile phone which was set in advance. 13. The service center will help the user after receiving the alarm, and the user's position will be sent to the monitoring mobile phone by SMS.