Sayodevice Osu O3c Rapid Trigger Hall Switches Magnetic Linear Switches Keyboard With Knob And Screen,copy Paste,shotcut,macro Hotswap Mini Keypadaa O3C OSU SayoDevice KeyboardThis keyboard with 3 Hall magnetic linear switches, 1 knob, 1 screen! TYPE-C,USB 2.0 high-speed 8000HZ.Replaceable SwitchesSupports any Hall magnetic Switches, with a simple click for calibration.IPS color ScreenWith 0.96 inch IPS color screen,160*80 Resolution, visible key range and button counting.Custom ScreenThe first line of text on the screen can be customized, such as writing your own ID.Custom KnobThe knob can also be set with any key, such as to scroll through the song list.NOTICESometimes, the keyboard needs to do "CALIBRATION" ( The steps are shown in the figure ) before use for the first time or after firmware upgrade.