65% ultra-compact design with detachable cable leaves more room for mouse movement. Remains 100% original 104 keys function while needing a smaller desk space. K631 upgraded to the USB-C wired cable to a 2-in-1 wired cable (with both USB-C/A jacks). The unique exclusive structure design of the socket makes the switch mounting easier and less wobbling. Hot-swappable, no matter 3-pin or 5-pin. Quiet basic linear mechanical switches and soft key travel make registering every click easy.