The Bourns Rotary Encoder has a 3.2mm shaft diameter, which is smaller than the usual 0.25" shaft. This is not a problem with the Adafruit rotary encoder, which includes a matching knob. How they work. Rotary encoders work by providing two switches that are activated in sequence when you rotate the knob.
UM-70 is a 70 keys split keyboard in 65% layout with RGB, macro keys, OLED screen and encoder housed in PLA 3D printed cases. It also supports audio for the beeps and the bops (AST1109MLQ buzzer required and not included in the kit). Perfect for those who want to try out various functionalities QMK offers with a single board.