The casing also contains a small LED indicator lamp that lights up when a button is pressed, for example. unlocking, locking, trunk, panic button) are integrated into the top of the transmitter. The buttons used to actively operate the functions (e.g. The ID transmitter consists of a splash-proof housing that contains the electronics, antennas, and buttons. Home / Car parts / Sonne repainting systems.Exhaust gas aftertreatment design diagnostics.