1. can preset torque value and have sound alarm prompt. When the tightening torque of the fastener reaches the preset torque value, it can automatically send out a signal "click" sound, accompanied by obvious hand feel vibration, indicating that the work is completed. After the force is released, the relevant parts are reset automatically.2. automatically switch in the reverse direction, both sides to use simple and convenient.3. use straight line scale plus secondary scale, the scale line reading is clear and accurate.4. jacket is made of nylon material, strong and wear-resistant. Types: 0.5-3.0NM/1.0-6.0NMColour:blueMaterial:Plastic + MetalSize:about 156mmPackage Contents:1 x Preset Torque Screwdriver4 x batch headOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.