Hitachi DS13DV2 Cordless 12 Volt 1/2-Inch Driver Drill 1/2" keyless locking chuck with spindle lock for manual driving Electronic feedback power control enables higher, more consistent torque even at low rpm 22-stage adjustable slip-clutch High performance rare earth magnetic motor with 2 Ah batteries to maximize run-time 30 day satisfaction guarantee and a limited one-year warranty on parts and labor