[Maximum speed 45000RPM]: The rechargeable nail drill matched with a mobile power supply can work for up to 10 hours after being fully for 2 hours. [Low Heat/Noise]: The professional nail drill for acrylic nails is designed with a brushless motor, aluminum alloy body, high-quality bearings and internal cooling system. [LCD Smart Screen]: The LCD smart screen can clearly display the speed, rotation direction and remaining power so you can operate as needed. [Multifunctional]: The acrylic nail drill can be used for grinding, cutting, polishing, acrylic powder, carving and removing gel nails, cuticles and Does not hurt hands and nails. Product name:Nail Drill machine Model:V4 Variable speed:0-45000RPM (adjustable) Battery capacity:2600mAh Charging time:2 hours Working hours:up to 10 hours Input voltage:DC5V,2A Instructions for use: 1. Rotary switch comes with:open,close,speed; 2. Forward and reverse buttons, default positive rotation (display: F) 3. USB charging port can provide mobile phone charging function. 4. Type - C grinder charging interface. 5. Connect the connection port of the polishingpen to the host o 6Pause button can pause the function in use; 6. Speed display:00-45RPM, representing 0-45000Turn to adjust the number.Forward and reverse display: the default forward rotation "F" at boot,press onePress the power button to reverse the "R",and press the power button again Key toreturn to forward rotation. 7. Power display:When the battery is turned on,the battery compartment is empty,which means the battery is dead,and the battery compartment is full,which means the battery is fully . 8. The pen holder can be inserted on the left and right sides. 9. Tighten the steering of the pen, place the polishing on the bottom and clampit. Colour:Multicolor Material:Plastic Package Contents: 1 * Main Machine 1 * Handpiece 1 * Pen Holder 1 * Connection Cable 1 * USB Charging Cable 1 * Nail Drill Bit Set 1 * English User Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.