20v, max, lithium-ion 1/2", high torque impact wrench, no battery or charger included, 400 ft/lb maximum torque to perform a wide range of heavy duty fastening applications, ergonomic handle provides user superior comfort & control, variable speed trigger with electric brake provide user improved control, led light provides user greater visibility when working in dark environments, durable magnesium gear case & all metal transmission for extended durability.