Combination back-up safety device & lamp. Provides a clear 87dB "beep, beep" when vehicle is put into reverse gear. Installs as easily as replacing the existing bulb!. For best results - do not use with Shock/Mount lamps, TPE lamps (5010 series). 20 watt halogen bulb provides greater light output when vehicle is in reverse. Perfect for cars, school busses, vans, RV's & light trucks. Additional safety devices safety bulbs do not meet OSHA or SAE J994 requirements for commerical back-up alarms.