& 12304;Upgraded Handpiece Design& 12305;Made of the special material, aluminum alloy. Ample ventilation holes are designed for dissipating the heat effectively. Handpiece comes with torque and a twists lock system. Low heat, Low noise, Low vibration. & 12304;Speed Up to 45000RPM& 12305;This upgraded nail drill equipped with bearing, which enables it work smoothly at a high and adjustable speed (0-45000RPM) forward or reverse by rotating the speed control knob easily with smart LCD clearly display. & 12304;Portable & Rechargeable& 12305;Built-in 4000mAh large capacity battery, Being fully charged for about 2 hours, the nail filer electric will work up to 10 hours, and you can also use it as power bank for your phone. Smart and portable Design that you can portable take and use this electric nail file at anywhere anytime. & 12304;Smart Display, Easy Control& 12305;Equipped with smart LCD display, Which can clearly display the right speed, rotation(forward/reverse) and the precise remaining capacity of the battery for recharging. Then you can easily use the button to control the drill nail, which more efficient. & 12304;Professional Multifunctional& 12305;Our nail drill is functional, versatile, and quiet. Designed with 12 kinds of metal bits and sanding bands, suitable for all kinds of 3/32" shank bits. Awesome for nail buffing, filing the shape of various nails, and smoothing calluses or hardened skin on your hands and feet.