Features: 1.Programmable: One handed mechanical keyboard is programmable. All key functions for Windows keyboard standard can be set and complex combinations of shortcut keys can be realized with one click. 2.4 Key Design: Programmable keypad is 4 key design with a reasonable number of keys for various programming settings. It can be operated with one hand and is easy to carry, which is very convenient. 3.Plug And Play: 4 key programmable keypad has a special setup program that allows repeatable settings. Settings can be saved in the keypad and do not need to be set up again when changing devices. 4.Available Systems: 4 fully programmable keys can be used on for Dos, for Windows All, for Linux, for OS X, for Android, etc. after the key definition software is set up under for Windows based. 5.Applicable Scenarios: Programmable keypad can be connected to the same computer without interfering with each other. Suitable for office, music, media, industrial control, laboratory, production line testing. specification:Item Type: One Handed Mechanical Keyboard Material: Acrylic, ABS Color: Black Number Of Keys: 4 Keys Shaft: Model Blue Switch Connection: Type C Wired Applicable Models: Computer General Purpose PackageList: 1 x Keyboard 1 x Type C Cable