Here is an electric pen that lets you engrave and polish various materials, including wood, steel, jade, PLA, stone, glass, and crystal. The SGS PRO comes with Bluetooth and has an OLED display to show battery level, selected mode, and other information.
This smart pen has memory to remember your settings. It runs for 120 minutes on its 500mAh battery. You can control the SGS PRO from iOS and Android devices. You get 4 modes with adjustable speed and direction.