1Adopts LCD screen, clear display of rotation direction, speed, battery remaining capacity, convenient for use. 2Pen holder design, can be placed on both sides, bilateral pen holder buckle, considerate design. 3Power bank function, not only the polishing pen power supply, but also can be used to charge mobile phones. 4Rechargeable design, builtin 3000mAh largecapacity integrated battery, which can last up to 12 hours on a single charge. 5Adjustable rotating speed 035000rpm, rotate the knob to adjust the speed, meet your different needs. 6Forward and reverse rotation directions make you feel easy to use left and right hands for nail polishing.