Emits a loud "bee bee" sound when vehicle is shifted into reverse and back-up lights come on
Gives an audible alarm when the vehicle is put in reverse
Alerts children and pedestrians to prevent backing up accidents
These alarms help ensure safer driving. For 12V vehicles with back-up lights. Durable and weatherproof plastic alarms hook up easily under rear of vehicle — only 2 wires to hook up. Instructions included.