DEWALT 12V Cordless Screwdriver & Impact Driver Combo Kit (DCK210S2) Maximum initial voltage on batteries (measured without a workload) is 12-volts, under a workload nominal voltage is 10.8 1/4-inch one hand loading hex chuck, compact 6-1/4-inch bodies for greater maneuverability 3 LED lights to provide visibility without shadows Powerful 12-volt, 1.1 Ah lithium-ion battery packs Impact driver has 79 foot-pounds of torque; screwdriver has 160-unit-watt output