The V4 Craftsman Screwdriver is compact, versatile and easy to use. It has an innovative 1/4 in. hex quick release that accepts all hex shank bits, including 1 in. bits that most other screwdrivers cannot accommodate. It is powered by a 4V lithium-ion battery. Also included is a battery, 2 driving bits and charger. There are six other tools that operate with this battery.