Features: 1.DIY DESIGN: Red switch mechanical keyboard is hot swappable, you can change keycaps and key shafts as you like, colorful backlight. 2.COMFORTABLE KEYS: Mechanical gaming keyboard keys are ergonomically designed with curved surfaces to fit the human fingers for easy and comfortable triggering. 3.COMPATIBLE SYSTEMS: Compatible with for Windows, for Linux, for OS X, for Android and for iOS systems. Please set it up on for Windows system or for OS X first, then you can use it freely on other devices. 4.WIDELY USED: 3 keys programmable keyboard is widely used in video games, office work, PPT, sheet music page turner, equipment image catching, factory machine control, piano keyboard test and so on. 5.DURABLE CONSTRUCTION: The One handed keypad features ABS and acrylic construction that can withstand up to 500,000 keystrokes. Mechanical switches give flexibility to every word you type. specification:Item Type: 3 Key Mini Keypad Material: ABS, Acrylic Scope of Application: Computer Number of Keys: 3 Switch: Red Switch PackageList: 1 x Keyboard 1 x USB Cable