TS-MG1 Mini Grinder Cordless Rotary Tool Kit Portable Grinding Polishing Sanding Engraving Drilling MachineFeatures:【3-Level Adjustable Rotation Speed 】 With speeds from 5,000 to max 15,000 rpm, which ensures optimal usage and different applications.【35 Multi-function Accessories 】 Make fine design on wood, plastic, glass, stone, and metal with optimum precision and control【Multiple Purposes 】 Grinding, Polishing, Sanding, Engraving, Cleaning, Drilling【Build-in large capacity battery, USB Charging 】 Operate cordless after charging without always being plugged in.【Recessed Power Button 】 Prevent device stop caused by accitouch switch.【Vent Holes 】 Effectively dissipate the heat to extend battery life.【Rubber Handle 】 Make sure you are comfortable to hold and control.Specifications: Name:Cordless Rotary Tools Kit Model:TS-MG1 Rating:4V DC No-load speed:5000-15000 r/min Charging time:2 hr Maximum chuck capacity:3.2 mm Power Type:USB Charging Working Time:90minsPackage Included:1x TS-MG1 Rotary Tool 2x Collets (3.2/2.4mm) 1x Accessory Case 12x Sanding Band 1x Sanding Shank 2x Felt Wheel 2x Felt Wheel with Shank 1x Bristle Brush 1x Felt Wheel Mandrel 6x Grinding Wheel with Shank 2x Drilling Bit 6x Diamond Grinding Needle 1x USB Cable 1x User Manual 1x Warranty Card Installation Steps:1.Press down the spindle locking button, take off the black nut.2.Choose the suitable chuck and put the black nut.3.Insert the accessory you need, screw on the nut.4.Release the spindle locking button.