Features: 1. DIY DESIGN: Red switch mechanical keyboard is hot swappable, allowing you to change keycaps and key switches as desired, with colorful backlighting. 2. COMFORTABLE KEYS: Mechanical gaming keyboard keys are ergonomically designed with curved surfaces to fit the natural shape of fingers for comfortable and smooth keystrokes. 3. COMPATIBLE SYSTEMS: Compatible with Windows, Linux, OS X, Android, and iOS systems. Initial setup should be performed on Windows or OS X before using with other devices. 4. WIDELY USED: 3-key programmable keyboard suitable for video games, office tasks, PPT presentations, sheet music page turning, equipment image capture, machine control, piano keyboard testing, and more. 5. DURABLE CONSTRUCTION: The one-handed keypad features ABS and acrylic construction tested to withstand up to 500,000 keystrokes. Mechanical switches provide responsive and precise typing performance. Specifications: Item Type: 3 Key Mini Keypad Material: ABS, Acrylic Application: Computer Number of Keys: 3 Switch: Red Switch Package List: 1 x Keyboard 1 x USB Cable