... parameters by USB28,Less GPRS traffic29,ACC working alarm30,GPS drift suppressionOptional functions:31,Quiver alarm32,siren/horn33,Accident ... logistics/Vehicle rental Technology parameter:1,GPS chip: SIRF3chip 2,GPS sensitivity: -159dBm 3,GPS accuracy :5m 4,Time To First ... software tracking. 4,Web server online tracking Car GPS tracker with waterproofshell,build-in shock sensor,large capacity battery,