1)Upgrade optional. 2)Long range monitoring. 3)Womdow roll up control. 4)Recharge Li-battery. FM Two Way Car Alarm System With Remote Engine StartHere below are the complete features for our two way car alarm system with remote engine start.1.FM-FM two way LCD transmitters with icons    2.Vibrating and audible warning        3.Responding distance up to 3000 meters range, transmitting distance up to 1000 meters range      4.Car finding/help calling, Re-arm, LED indicator, Exact detector       5.Engine cut off6.Remote engine start    7.Side door unclosed well reminding, Arm reminding  8.Remote transmitter and receiver check code( learn code)     9.Electrical/Pneumatic central locking optional          10 Silent Arm11.Remote trunk release      Technology parameterA. Main EngineWorking voltage:12V+ 2V        Static current: 100uA   Working current: 100mACurrent of vibration sensor < 1mAWorking current of flash light output: 5A ×2Working current of trump output: 10AWorking current of BIBI output: 10AWorking current of central door locking output: 10AFrequency: 300MHz ~ 350MHz-433.92MHZ