We are offering Car alarm system with gsm signals weak warning * compatible original car remote * lock door against pushing pedal brake features: unique feature 1 emergency number reorganization, refuse strange phone number 2 be compatible with factory original remote fobs anti-thief function: 1 door open/car vibration/car moving/battery low/power disconnected alert. 2 alert call to user's telephone by voice 3 stop engine by phone 4 lock/unlock the door by phone 5 central lock automation 6 arming and closing windows automatically if forget. Anti-rob functions 1 with stealthy sos button 2 remote voice broadcast 3 remote monitoring the sound in the car 4 lock the door automatically against pushing pedal brake handfree phone call 1 talking with the driver 2 one key dial 3 redial 4 volume adjustment other useful functions: 1 gsm signals weak warning 2 silent alarm mode available 3 shock sensor sensitivity adjustment available 4 light flash and sound alarm specification (1) main unit working voltage: 12v static current: 40ma-60ma working frequency when arming and disarming: 400mhz-433mhz cover scope: same as gsm alarming time: alarm until disarm or answer the phone which receive signals sound or mute alarming depends on the design of the car after factory (2) output voltage for controlling stop engine voltage: 0v control oil voltage: 0v control loudspeaker voltage: 12v (3) input voltage door check voltage: 0v key check voltage: 12v break check voltage: 12v.