OLED Smart Display and Knob with Multiple Uses The keyboard features a new built-in OLED screen and knob that shows dynamic images, wired/2.4G/Bluetooth mode, WIN/MAC, and battery power. Light brightness, volume control, and light mode switching are all knob functions. Three connection modes are available: 2.4GHz, Bluetooth 3.0+5.0, and Type-C wired. To accomplish effective multitasking, simply switch between three modes (buttons on the left side of the keyboard) and connect to devices within ten meters with ease.