Power Supply:9V - 36V / 1.5A Backup Battery:500mAh Normal power consumption:55mA/h Dimension:65mm x 61mm x 26mm Weight:90g Work time:30 hours in power-saving mode and 7.5 hours in normal mode Operating temperature:-20° to 65° C Humidity:5% to 95% Non-condensing Frequency: 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 GPS Module:latest GPS SIRF-Star IV 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 Velocity Limit:515 meters/second (1000 knots) max Altitude Limit:18,000 meters (60,000 feet) max LED:2 LED lights to show GPS/GSM status Flash Memory:8MB Button:One SOS Button Interface :3 digital inputs (1 negative, 1 positive triggering and 1 input changeable) 1 analog input 1 output. -