1) Support for 2 buttons fast dial, emergency SOS button 2) SOS button send out an emergency distress signal and send the exact location to monitor center. 3) Built-in microphone, support monitoring functions 4) Display speed, coordinates and altitude information. 6) Support set-up time, continuous / non-continuous tracking. 7) Support the electronic fence function. Support alarm and remote tracking. 8) Care center could find moving objects’ place (need system support) via SMS / GPRS. 9) Features of track record, historical track playback (requires system support). 10) 60 hours -72 hours standby time. * Specifications： 1) Mode: GSM/GPRS double frequency 900/1800 (850/1900 optional) 2) GPS: Japan's high-sensitivity JRC module 3) Appearance dimension：65（length）×46（wide）×17（thickness）mm 4) Button: On-off buttons, MODE, SOS, 2 phone buttons 5) USB port: MINI-USB（12PIN） charge/headphone jack /DATA 6) SIM position: built-in SIM position 7) Built-in MIC: Talk and listen 8) Display screen: OLED screen，128*128pels 9) Electric power: 3.7V replaceable 450-500mAh rechargeable lithium battery, 5V Charging Input 10) Earphone: 12PIN USB port， with MIC(Optional) 11) Current sinking: Communication time: average current 250mA following 12) Standby time: 5mA (power saving mode) 13) Surroundings: Working temperature: -30～+70C Storage temperature: -40～+80C Humidity：20～90% （no condensing)