The e-LIGHT 500 is an all-new revolutionary lighting system that fully illuminates the entire bed of your truck with ease. Universal in nature, the e-LIGHT 500 has been designed to work from any location inside the truck bed, and can be recharged on the go. The optional 12v charging cradle allows you to hardwire a charging cradle anywhere you need it on your truck. The best use of the 12v charging cradle is to mount it where you want your e-LIGHT to be mounted, so that your e-LIGHT will always be charged when you need it.