USB rechargeable nail drill kit is an all-in-one nail maintenance device that allows you to "bring your beauty salon home" and do your own manicures. Functional, versatile, and easy-to-use. It's an essential tool for nail-care veterans and newcomers alike. Technical Specifications: Voltage Power: 5V 2A, 42W Rotate Speed: 35000 rpm Charge Time: 3H Work Time: 8H Package Includes: 1 x Electric Nail Drill Machine 1 x Handpiece 1 x Ceramics Grinding Drill Bits 1 x USB charging cable 1 x User Manual How To Replace Nail Drill Bit? Step 1: Turn left side (clockwise) until you hear it click into place. Note: When you replace the drill bit,please DO NOT close the drill hole without insert drill bit. Step 2: Take out the original bit. Step 3: Insert your desired bit. Step 4: Turn right side (anti-clockwise) to lock the bit tightly. Note: After use, please INSERT the attached needle. Conclusion: Mastering the skill of handling the nail drill bits is a must for someone who wants to be great at doing artificial nails. This skill will enable a nail technician to quickly create a great set of nails with little effort. When you are good at using drill bits, your hands and wrist will not be subject to so much repetitive motion of hand filing the nails. Therefore, you will reduce the chance of getting hand and wrist fatigue and injuries.?Nice Gift for Women?: Low heat, quiet, great aluminum body for efficient heat dissipation,good quality makes it extremely quiet and smooth with slight vibration when doing nail care. Fashionable and space-saving appearance design are lady's favorite. ?Easy to Use?: No matter you are nail professional or beginner, for home or salon use, this manicure Efile kit can give you the best service in nail drill work. It is easy-operating but also professional enough for seasoned tech for its simple and convenient design. ?New Upgraded Handpiece?: This portable nail drill machine is of light weight, low vibration, low heat, low noise and sturdy. Light hand piece with adjustable high speed for smooth and long-time operation in nail art. ?Powerful Motor Up to 30000RPM?: Professional nail drill is designed with high adjustable 30000rpm max in speed, which enables most professional nail work for acrylic nails and gel nails such as buffering, grinding, etc. ?2500mAh Rechargeable?: Charges for about 3 hours, and continuous use up to 8 hours without cord. Equipped with smart LCD display, Which can clearly display the right RPM to choose and the precise remaining capacity of the battery for recharging.