Specifications Power supply +6V - +35V / 1.5A Backup Battery 76mm x 50mm x 24mm Weight 76g Operating temperature -20° to 55° C Humidity 5% to 95% (Non-condensing) Frequency GSM 850/900/1800/1900Mhz GPS Chipset latest GPS SIRF-Star III chipset GPS Sensitivity -159Db GPS Frequency L1, 1575.42 MHz C/A Code 1.023 MHz chip rate Channels 20 channels all-in-view tracking Position Accuracy 10 m, 2D RMS Velocity Accuracy 0.1 m/s Time Accuracy 1 us synchronized to GPS time Default datum WGS-84 Reacquisition 0.1 sec., average Hot start <1 sec., average Warm start <36 sec., average Cold start <36 sec., average Altitude Limit 18,000 m (60,000 feet) max. Velocity Limit 515 m/second (1000 knots) max. Interface 4 input and 4 output LED 2 LED lights to show working status.