With 3 adjustable speed level, this multifunctional mini electric grinder can be used for polishing/grinding/drilling ceramic, plastic, iron bar, walnut, wood, etc.Note:*Keep the machine away from the reach of children.*Please allow an 1-3cm error due to manual measurement.*Please read the user manual carefully before use.*Do not apply it on hard materials.*Pull out the plug before maintenance.*Keep the machine clean.*Keep the air vent unimpeded.*Do not use the sharp material to clean the machine.*Do not let liquid enter into the machine to prevent it from rusting.Specifications:Color: GreyMaterial: ABSCollet Chuck Diameter: 0.5mm / 1mm / 1.5mm / 2.4mm / 3mm / 3.2mmRated Voltage: 3.7VRated Power Output: 20WNo-load Speed: 15000rpmCurrent: 5.5ACharge Port: Micro USBBattery Type: Lithium BatteryBattery Capacity: 380mAhCharging Voltage: 5VItem Size: 15*2.5cm / 5.9*0.98inPackage Size: 21*8*6cm / 8.26*3.14*2.36inItem Weight: 100g / 3.52ozPackage Weight: 213g / 7.51ozPacking List:1 * Polisher1 * USB Charging Cable1 * Accessories Kit(6*Collet / 4*Grinding stone bits / 5*Drill bits / 1*Mandrel / 2*Grinding wheel )1 * User Manual