Item Type: Electric Nail Polishing Machine Material: ABS Rotational Speed: 0-40000RPM Package List 1 x Grinding Pen 1 x Host Connector 1 x Grinding Head 1 x Storage Box 1 x Instruction Manual 1. When switching the direction of rotation, the speed should be set to 0 or paused first. The machine needs 2 seconds to buffer during the switching process.2. When replacing the polishing head, the machine must be turned off and cannot be operated when turned on. If the polishing head is not locked, the handle will not rotate. 1[40000RPM Adjustable] Electric nail polishing machine offers a speed range from 040000 RPM, allowing you the flexibility to choose the perfect speed to suit your needs. 2[Quiet Smooth Operation] Designed with a high speed, low vibration, and low noise motor,nail drill machine ensures that you can work in peace without disrupting others. 3[Touch LCD Screen] With its large touch LCD screen display, which combined button and display, you can easily monitor your RPM data in real time and select rotation direction on it. 4[Convenient Power Source] Electric nail polishing Machine is powered via a USB interface, allowing it to use a variety of power sources, including plug sockets, computers, and power banks. 5[Portable Design] Nail polishing machine is designed to be compact and lightweight, making it easy to carry around and use anywhere, without taking up too much space.