HD Digital display revolutionMagnetic absorption for nail drill bitsNO noise, no vibration or heatMultifunctionCombination of fast converting polisher and multi-function power box .Carving, Engraving, Routing, Grinding, Sharpening, Sanding, Polishing for Acrylic Nails,Gel Nails,Artificial Nails,Natural Nails,Pets' Nails,not suggest using for something hardMain machine weight:365gMain machine size:126*121*38.5mmItem Type: Electric Nail DrillMaterial: Aluminum + ABS + Stainless steelColor:Silver ,Pink ,Sky blueRotate Speed: 0-35000RPMGrinding diameter :2.35MMOutput Voltage:DC 3V-18VPower:30WDigital display gear: 0-35Q1 : Does it has memory function ?A : Yes ,When you turn on the nail drill machine , it will start work at the gear you turn off the last time.Q2 : Can the sander change direction of rotation (Forward / Reverse)?A : Yes.you can control it via touch the panel rotation mark.