WOLO BEEP-BEEP BACK-UP ALARM 

WOLBA52 Wolo Beep-Beep Back-Up Alarm	Product Code: WOLBA52 Price: WOLBA52 Check Latest Produces a loud beeping sound when vehicle is put into reverse. Small in size, for easier installation. The warning sound can be a life saver. Easily installs to any 12 volt vehicle with one wire.