Red Switch: This programmable keypad adopts mechanical structure and red switch, which ensures more sensible key feedback and longer service life. Widely Compatible: This mini mechanical keypad is suitable for Win, for Vista, for Linux, for OS X Laptop. Easy and convenient for connection. Customizable Function: This mini keyboard is designed with 6 keys and 1 knob that can be customized at your will, improving the flexible operation of work and games. Ergonomic Design: This gaming keypad also features ergonomic design which can fit for the palm curve, reducing hand fatigue. Durable ABS: This 6 key keypad with knob is made of premium durable, waterproof and dustproof ABS material.