[ High Speed Bearings ] -- Our superior nail drill is equipped with a powerful bearing, which works smoothly at a high and adjustable speed (0-35000 RPM) by rotating the speed control knob with ease. It won't get too hot or make loud noises or vibrations during operation, even at top speed.great acrylic nail drill for both professional nail salon use and DIY your nails at home,making your nail art creation even more enjoyable [ Low Heat/Low Noise/Low Vibration ] -- Made of the special material, aluminum alloy. Ample ventilation holes are designed for dissipating the heat effectively. Do your nail smoothly and enjoy the feeling of low vibration. It will not let your hand be numb after long-term use. Different from a traditional file strip, the electric polish grinder is more efficient and fast, that enables a more stable and delicate effect [ Rechargeable Nail Drill ] -- Our professional nail drill machine comes with a large capacity battery 4000mAh, which charges for about 1.5 hours, can be used for up to 7-10 hours, portable size (6.2*3*1.5 inch) and light weight of this electric nail drill make it compact to pack into your bag for carrying out conveniently anywhere anytime