DC12V 75dB Siren Beeper Buzzer Sound Adapter Slim Invisible Fits Car Vehicle Reversing Reminders Parts The adapter emits a humming or buzzing sound when the car lights remain on after the key is removed, serving as a reminder to switch them off.It operates on a 12V system and produces a sound level of 75dB.The device features a compact design with housing dimensions of approximately 38 x 17 x 14mm and a total length of about 16.5cm.It can be mounted using screws or adhesive tape in various locations such as the fuse box or driver's door.Mounting holes measure approximately 2.31mm.The unit is black in color and integrates discreetly into vehicle interiors.The package includes one car light-off system for 12V vehicles.