One push button to start/stop the engine.RFID engine lock.In arming mode,when the key gets close to the detection circle(about 2-5cm),the system sound Bi Bi,which indicates the system is disarmed.Otherwise,the start button not work. Open acoustics and dashboard function.Automatically lock the host after stalling .Immobilizer,with warded lock card anti-theft function,the system enter arming mode after 15 seconds automatically when car is stopped. safety without another operation while driving,Compatibility with current smart keys and starting alarm system,Protect the risk with anti-theft system Voltage:12V Colour:Black material:plastic Packing size:17*14.5*5cm Package Contents: 3 set * car keyless entry burglar alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.