Features: A mini keyboard with custom functions.Type-C USB interface, no driver, plug and -play, You can set all the keys functions on the standard windows- keyboard, one-key to achieve complicated and complex combination shortcut keys. The operation is simple, and it is convenient and easy to carry when connecting multiple keyboards. Support corresponding keys combinations and special keys on the keyboard, and set Alt Ctrl WindowsAll Shift keys combinations;. Widely used for Dos WindowsAll, linux Androids etc Specifications: Item: Mini Keypad Interface type: Type-C Model: MK321U Number of keys: 3 Keys Life: 50 Million Clicks Working current: 5V 15mA Size: approx 75x37x28mm/2.95x1.45x1.1in Color: Black/White Package Includes: 1 PC x Mini Keyboard note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurment.