Features:1) Communication with GSM/GPRS， GSM frequency 4-band 850/900/1800/1900， can be used wordwide. 2) Powerful magnet and water proof bag， can be adsorbed in hidden places. 3) Track by your computer/PDA/cell phone/Google earth or our platform 4) Auto track， automatically get information with interval 5) Position by both GPS and GSM， when lose gps， it will position by GSM. 6) High sensitivity: very quick to get GPS signal and reply to your call or SMS. 7) Geo-fence: send alert when out off preset fence. 8) With ovement alert/over speed alert/low battery alert/SOS alarm， GPS off alert. 9) State checking function: can check state of GSM， GPS， GPRS and battery. 10) Small size and weight， unit size 65*45*15mm， NW. 50gNote: This machine will turn on when you install battery well， it has no button to turn off， you have to remove the battery if you want to turn off the machine， or the machine will turn off when it has no powerSpecification:1) GPS chip: SIRF3 chip2) GPS sensitivity: -159dBm3) GPS accuracy: 5m4) Time to First Fix: 45s (for Cold status); 35s (for Warm status); 1s (for Hot status)5) Battery: Changeable 3.7V 800mAh Li-ion battery (1 batteries included)6) Network: GSM/GPRS7) Band: 850/900/1800/1900Mhz8) Wall charger: 110??220V input， 5V output9) Storage Temp: -40?��C to +85?��C10) Operation Temp: -20?��C to +55?��C11) Humidity: 5%--95% non-condensingPackage includes: 1pc TK102B GPS tracker1pc USB Charger Cable1pc Battery1pc English ManuelNOTE:As the effect varies from monitor to monitor， there is irrevocable slightly difference in colors between the color showed on your monitor and the real one， So if dear you can not accept this very little difference， be cautious before you making the orders.thanks for understanding.