1Versatile Functionality: The roasting lamp can also be used as a nail polishing machine, making it a multi-purpose tool for your beauty routine. 29-Speed Adjustable: With 9 different speed settings, you can easily customize the intensity of the polishing or roasting process to suit your needs and preferences. 3Bidirectional Rotation: The forward and reverse rotation feature allows for a more efficient and thorough polishing or roasting experience, ensuring even results every time. 4Convenient USB Charging: Say goodbye to bulky adapters and tangled cords - simply plug in the USB cable and charge the device effortlessly. 5Built-in Battery and Screen Display: The built-in 500mAh battery ensures a long-lasting power supply, while the screen display allows for easy monitoring of the battery level and speed settings.