1、DUAL MODE CONNECTION: 9 keys programmable keyboard supports both USB and Bluetooth connection modes and switch automatically. Type C to USB interface, no driver required, plug and play. 2、3 ADJUSTMENT KNOBS: 9 keys mechanical keyboard comes with 3 knobs, the knobs have click function and can be used as left and right mouse buttons. Knobs can be programmed with multiple functions. 3、WIDE APPLICATION: One handed macro mechanical keyboard is suitable for office, gaming, music, media, industrial control, laboratory, production line testing and other fields. 4、PROGRAMMABLE DESIGN: One handed programmable keyboard makes your work faster and more efficient, and makes the gaming experience more comfortable and fluent. 5、PORTABLE DESIGN: One handed programmable mechanical keyboard is small and lightweight, does not take up much space, effectively saving desktop space, easy to carry and use.