Class 12 GPRS and 66 channel GPS with -165 dBm tracking sensitivity and 1.5 meters accuracy The operational range of 8.5 volts to 65 volts DC 4 digital optically isolated inputs 2 RS232 ports, 1 USB configurable (On-demand CAN Bus interface extensions) for more details click here- https://aryaomnitalk.com/gps-vehicle-tracking-system/