The DeWalt DCD939KX is a 14.4V 1/2" hammer drill. It comes equipped with a one hour charger, a 360 degree side handle, and a heavy-duty kit box. The device uses an all-metal transmission that has three speeds, useful for matching the speed of the hammer drill to the task that is at hand. The heavy-duty 1/2" self-tightening chuck improves the bit grip and strength of the device, while its powered by two XRP extended run time 14.4V batteries. The DeWalt DCD939KX has a high efficiency motor that uses 310 unit watts at max power and weighs 5.25 pounds, making it lighter than other devices of its class.