VT600 3G gps tracker is one of our most selling device,which has got good feedback from market. Currently we have regular client in China,Thailand ,Australia ect VT600 3G GPS Tracker features: VT600-3G-T UMTS/HSDPA: 850/2100MHz GSM/GPRS: 850/900/1800/1900MHz VT600-3G-A UMTS/HSDPA: 850/1900MHz GSM/GPRS: 850/900/1800/1900MHz VT600-3G-E UMTS/HSDPA: 900/2100MHz GSM/GPRS: 900/1800MHz Features: Track by SMS/GPRS Track on Demand/ Time Interval Internal 8MB Memory for Logging Inbuilt Tremble Sensor Internal Backup Battery SOS Alarm, Geo-fence Alarm GPS Blind Area Alarm Low Battery Alarm, Speeding Alarm External Power Cut Alarm Engine Cut (Engine immobilization) Fuel Monitoring, Linsten-in (Optional) 3 Digital Inputs + 1 AD+ 1 Outputs