DIY Programmable -- All keys are programmable. All key functions of the standard for Windows keyboard can be set, and a complex combination of shortcut keys can be realized with one key. Small and Portable -- Small and portable, you can carry it with you, effectively saving desktop space. 2 Knobs -- It can be rotated to adjust and can also be used as a button. The knob can be set to zoom in, pause, play and other functions. USB Cable -- Comes with a detachable USB cable. You can connect a keypad (plug and play) and another keyboard at the same time on the same computer and they won't interfere with each other. Wide Applications -- Suitable for office, game, music, media, industrial control, laboratory, production line testing and other fields.