Features Cordless Impact Driver DTS141RFJ More compact and lightweight thanks to the newly-developed oil unit and brushless motor Incredibly low noise operation thanks to the impact mechanism using oil unit instead of anvil and hammer. "T" mode: Tightening mode for self-drilling screw and bolts. With the cooling system for oil unit, capable of long continuous operation. World's Shortest & Lightest among Cordless Oil-pulse Driver ( 136mm ) Soft Impact Low Noise 77db Using newly-developed oil unit as an impact mechanism instead of anvil and hammer, operation noise has been greatly reduced compared with cordless impact driver. * Includes 2 Batteries 3.0 Ah / 1 Charger Capacity / Machine screw : M4 – M8 Standard bolt / M5 – M8 High strength bolt  M5 – M6 Coarse thread (in length) / 22 – 125mm Impacts per minute (ipm) / Hard: 0-2,700 Impacts per minute (ipm) /Medium: 0-2,200 Impacts per minute (ipm) /Soft: 0-1,400 No load speed (rpm) / Hard: 0-3,200 No load speed (rpm) / Medium: 0-2,000 No load speed (rpm) / Soft: 0-1,200 Max. Fastening torque /    40 N·m Dimensions (L x W x H)  / 136x79x240mm Net weight / 1.2kg