Now you can feel safe knowing the cars behind you will see your brake lights. This slick little unit attaches to the inside of your rear window. For easy removal when you’re at a judged show attach the light with the included suction cups. For a more permanent installation double sided tape is also included. The light is divided into 3 sections, letting you use it for turn signals as well as brake lights. Works with either positive or negative ground vehicles. Instructions included. This light is 12 “ long , 5/8” tall & 7/8” deep.