GPS vehicle tracker

main features: the GPS tracker system mainly used for vehicle tracking,it can tracking the car and control the car by sending SMS message to the unit. the unit will feedback the GPS latitude and longitude data by SMS message to user's mobile phone,so user can know the car anywhere. it can also stop the car any time and anywhere by sending a command in SMS format to the device.quite suitable for any kinds of vehicle , user can also build a monitor center to monitor the car position by using this GPS terminal. 1. specifications Communication mode:: GSM/GPRS/SMS Frequency band: 900/1800/1900/850 MHz Sensitivity: Nominal -104dBm Size: 73*45*19(mm) . Power supply voltage: 7-36VDC Working current: 40-100mA(12V) 20-50mA(24V) Working temperature: -20°C to +70°C. Storge temperature::-40°C to+85°C Working humidity: 5% to 95% Backup battery: lithium 3.7V for up 5 hrs. 2. GPS performance a. Position mode: satellite data and SMS b. Construction: 20 channels synchronous following twenty satellites, L1band(1574.42MHZ),C/A code(1.023MHz) c. capture time: 2.0s, warm up time 15s, typical initialization 35s, cold initialization 40s. d. position precision: 1-5m.