Voltage:18V(20V Max.) No load speed:0~800/1200/1800/2200r/min Impact rate:0~1200/1900/2700/2900IPM Battery capacity:4.0Ah Chuck capacity:1/2inch(12.7mm) Max.output torque:850N.m Fastening torque:350/430/700/850N.m(紧固扭矩) Disassembly torque:1100N.m(拆卸扭矩)