It's a 7.two volt lithium ion battery and drives screws together with other fasteners at 220 foot kilos. A quarter inch hex chuck enables very quick drill little bit improvements. Furthermore, it features a locking system that turns it right into a hand-pushed screw driver. Study Full Review $thirty? http://hammerhead-cordless-screw83725.blogs-service.com/19896272/new-step-by-step-map-for-hammerhead-4v-cordless-screwdriver