Brushless Motor Rated voltage：20V, No-load speed：0-1600/2000rpm Impact , No-load speed：0-1600/2000rpm Impact, frequency： 0-2500/3000bpm Chuck,Capacity:12.7mm , Max torque：320N.m Battery:4.0Ah*2, Charge Volts:220-240V~50/60Hz With 3 pcs,socket（17 19 21mm） Packed by color box