Items Specifications Power Supply +9V - +36V / 1.5A Backup Battery 850mAh Normal power consumption 85mA/h Dimension 104mm x 62mm x 24mm Installation Dimension 104mm x 83mm x 24mm Weight 190g Operating temperature -20° to 55° C Humidity 5% to 95% Non-condensing Frequency Quad Band GSM 850/900/1800/1900Mhz GPS Module 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 channel all-in-view tracking Position Accuracy 10 meters, 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 38 sec., average Cold start 42 sec., average Altitude Limit 18,000 meters (60,000 feet) max Velocity Limit 515 meters/second (1000 knots) max LED 2 LED lights to show GPS/GSM status Flash Memory 4MB Button One SOS Button Interface 5 digital inputs (3 negative and 2 positive triggering) 2 analog inputs 5 outputs.