O3C OSU SayoDevice Keyboard with 3 Hall magnetic linear switches, 1 knob, and 1 screen. Equipped with TYPE-C USB 2.0 high-speed 8000Hz polling rate. Features replaceable switches that support any Hall magnetic switch, allowing simple calibration with a click. Includes an IPS color screen with 0.96-inch display and 160x80 resolution, showing visible key range and button count. The first line of text on the screen can be customized, such as entering a personal ID. Customizable knob can be programmed to any function, such as scrolling through a song list. Note: Calibration may be required before first use or after a firmware update. Refer to the included instructions for calibration steps. Due to differences in lighting and screen settings, the actual product color may vary slightly from images. Slight dimensional differences may occur due to manual measurement.