OEM BMW E46 3 Series alarm system kit for 1998-2006 BMW 3 series Sedans Coupes and Wagons. (will not work with convertibles!).
The alarm system was a rare option to find on the 3 series, despite every E46 being pre-wired to accept it. This system will emit an audible alarm whenever someone opens a door, hood or hatch while the car is still locked.