Adopted of , it is practical and durable for long time use. It is not easy to get deformed and bring you much convenience. Design for , engraving, grinding, sharpening, sanding, polishing, etc. Easily meet your different needs, bring more conveniences. Features -Material: Aluminum alloy, ABS -Size: 15.70X2.30X2.30cm/6.17X0.90X0.90 in. -Charging Time: 3 hours -Working Time: 3 hours -Rated Power: 1.5W -Working Voltage: DC 3.7V -Working Current: 300-400MA - : 3000 - Professional nail drill machine can be used for natural or artificial nails, it is great for professional use, nail salon, makeup or home use. - Light weight, low noise, easy to replace bits without any problem. Pen shape, handy to operate. - Make it easier and safer to polish your nails. Effectively treat both delicate areas and rough . - It works safely with steady vibration, low heat and low noise, great for doing beautiful acrylic nails. - Great for manicure and pedicure care, fit for shaping, polishing, removing , etc. Package list: 1 x nail grinding pen 1 x controller 1 of grinding heads 1 x USB cable