Craftsman 4 volt Cordless Lithium-Ion Screwdriver with Case and 20 pc. Bit Set .0 volt lithium-ion battery pack provides power and longer run time 1/4 in. quick release collet accepts standard nut/screwdriver bits Two-speed gears (200 rpm / 600 rpm) allow you to match speed to job application Adjustable (24-position) Torque Clutch allows selection of proper driving torque needed for various Integrated Worklight provides direct light source to work area