Shock Alarm Easy D.I.Y installation : Only 3 connections. No need disassembly and no hard wiring work. Very easy operation: Just push the button "Lock" to activate and "Start" to release on remote controller Door Alarm This "Battery Power Disconnection" anti-theft function will not interrupt the car computer memory, radio channels, time on clock... etc. Buyer's label offered. Certificate: TUV FCC CE ROHS.