... GPRS/GPS Vehicle Alarm system,GSM and GPS tracking,radio frequency communication,voice control. Introduction,VAS is a complete GSM ... and unlock when disarming.- Remote controller Arm/Disarm, locate car in parkign lot with sound and light alertOther useful ... , SMA - Remote control, Working frequency, 315Hz/433MHz. Code, 1527/2240 study code Working Voltage, 12V (27A 12V dry battery) Control Distance ...