Function: 1. Adopts LCD screen , clear display of rotation direction, speed, remaining battery capacity, convenient to use. 2. Pen holder design , can be placed on both sides, double-sided pen buckle design, thoughtful design. 3. Power bank function , not only powering the polishing pen, but also can be used to charge mobile phones. 4. Rechargeable design , built-in 2600mAh high-capacity integrated battery that can run up to 12 hours on a single charge. 5. Adjustable rotational speed 0-35000 rpm. /min , turn the knob to adjust the speed, meet different needs. 6. Forward and reverse rotation directions make you feel easy to use left and right hand to polish your nails. Specification: Item Type: Nail Drill Material: ABS Power: 40W Power Mode: USB Product speed: 35,000 rpm /min Battery type: Built-in battery Battery capacity: 2600mAh Charging time : 4 hours Endurance time: 12 hours Product function: Functions like nail grinding, polishing, nail polish removal, dead skin removal, radian carving, etc. It is used for various manicures, accessories and beauty. Product features: high definition LCD display / can be used as a power bank / double-sided buckle; Host Size: Approx. 69 x 23 x 138mm / 2.7 x 0.9 x 5.4 inches Steps to use: 1. Power on: long press for 1 second; shutdown: long press for 1 second 2. The USB charging port can provide mobile phone charging function. 3. Forward and reverse display: The default forward rotation "F" after power on, press the power button to reverse "R", and press the power button to return to forward rotation. 4. Turn clockwise to increase speed; turn counterclockwise to decrease speed. Package List: 1 x host 1 x polishing pen 6 x polishing head 1 x pen holder 6 x sanding belt 1 x Type-C cable 1 x polishing head connection line 1 x Manual Note: 1. Thanks for understanding. 2. Monitors are not calibrated same, the color of the items displayed in the photos may be slightly different from the real object. Please take the real one as standard.