Autologix BACK UP ALARM Loud beeping alerts people your vehicle is backing-up Easy installation, no tools needed, just stick on reverse light Automatically activates beeping warning tone when in reverse ABS plastic, 1 1/2" x 1 x 3/4" IMPORTANT: This device will not work on vehicles with LED Back-Up Lights. Please determine before purchasing what type of light activates when putting your vehicle in reverse