... Main feature: 1,GPS tracker with waterproofshell 2,build-in shock sensor 3, large capacity battery Product Description: Model: GPS104This tracker ... is based on GSM/GPRS(850/900/1800/1900MHZ)wireless telecommunication internet and GPS satillite global position system,track ... lost vehicles, cargo.Movement alarm, Geo-fence alarm, shock sensor alarm, remote monitoring.3,Support map viewing on mobile phone ...