just like the beeper on commercial vehicles. It is powered by a special light sensor that triggers the beeper when your back-up lights go on. You can install a Safety Beep on both of your back-up lights making Safety Beep twice as loud for twice the protection! Today you can receive Safety Beep for the special introductory price of only $10.00 plus $6.99 shipping and handling.
Shipping Information plus $6.99 shipping and handling
Customer Support 1-973-227-8777 Mon-Fri 9am-5pm EST
Disclaimer Always read and follow manufacturer's directions that come with this product
Safety Beep 
Phone Orders:
800-311-0979 
