Ravin’s Electric Drive Kit delivers a revolutionary new way to cock/un-cock your R500 crossbow. This upgrade kit is composed of a motor and 12-volt lithium battery, and turns your R500 into a R500E. It attaches directly to the stock, and can cock/un-cock the crossbow with the push of a button. Alternatively, the R500E can be manually cocked with an R500 draw handle (not included). Ravin Crossbows Ravin Electric Drive System R152 Damaged Packaging UA4818