1Programmable Function: This mini keyboard is programmable, designed with knob. Allowing you to freely configure keys and functions, improve work efficiency and comfort. 2Dual Mode: This programmable keypad can be easily connected via USB cable or wireless BT, widely compatible with a variety of devices. 3Red Switch: This gaming keypad adopts mechanical structure and red switch, which ensures quicker response and longer service life. 4Ergonomic Design: This mini mechanical keypad also features ergonomic design which provides easier and more comfortable typing. 5Durable Acrylic: This one handed keypad with knob is made of premium acrylic material, which is strong, durable and resistant to wear. Item Type: Mini Keypad Material: Acrylic Connection: Wired USB/ Wireless BT Key Type: Red Switch Mechanical Keyboard (Knob Can Be Pressed and Used As Programmable Key) Supported Operating System: Suitable for Win, for Vista, for Linux, for OS X Laptop. Battery Type: Inbuilt 800mAh Lithium Ion Battery 1 x Mini Keypad 1 x USB Cable