Panasonic EY74A1LS2G Cordless 1/2-Inch Drill Driver Kit with Dual Voltage Technology Includes 2-4.2Ah Lithium Ion Battery, Charger and Carrying Case 4.2Ah Li-ion Battery Dual Voltage Technology - 14.4V / 18V Water and Dust Resistance Variable Speed/Reversible Low: 80-600rpm High: 220-1,750 rpm 1/2" heavy-duty keyless chuck