Features: 1.Multi-band(850/900/1800/1900MHz) 2.GSM cell phone carrier, 3.Arm/disarm by phone, and remote control, 4.Anti-hijacking, 5.Checking system sattus by telephone, 6.Remote trunk release, 7.Emergency help SW. 8.Can dial 2 alarm phone numbers and 1 emergency phone number when there is an alarm. GSM Car Alarm host: Working Voltage: 12V Static Current (+GSM Module): 40mA -60 mA Arm/Disarm Working Frequency: 315MHZ-316HMZ Cover Area and Capacity: identical to the GSM system Location Accuracy: 10-300M (which depends on the GSM service) Alarming Time: Last until it is disarmed or the alarm telephone is answered Voltage of the Output Control Point Ignition Control: 0V Alarm Control: 12V Petrol Control : 0V Siren Control : 12V Input Checking Voltage Door: 0V Key: 12V Foot Brake: 12V GSM Module Frequency Range: GSM 900MHZ/1800MHZ Voltage of Serial Interface: 2.8V Stand-by Current: 11-25mA Control Distance: No limit in the net work of GSM Remote Control Working Voltage: 12V(1 A27 12V dry battery) Working Frequency: 315MHz-316HMz Remote Control Distance: >20M <100M Static Current: 0mA Working Conditions GSM Car Alarm host: Storage Temp.: -30'C-85'C Working Temp.: -20'C-65'C Working Humidity: 25% ?95% Accessory Storage Temp.: -40'C-100'C Working Temp.: -20'C-85'C Working Humidity: 25% ?95%