More than 3 keys: Plug the mini keyboard and open the software, you can see there are 3 rows 9 buttons to set the key value. Simply switch the rows by pressing the "connect" button beside the USB type-C port. Wide range of applications: The programmable keyboard is widely used in video games control, office work,equipment image capture, instrument control, factory machine control, sheet music page turner, PPT, piano keyboard test and other occasions. Compatible with varies systems: Windows, Linux, Mac OS, Android and IOS system. Please set up on a Windows or MAC OS first, then you can freely use it in different OS devices. Our 3 Key mini keypad is designed for durability: OSU keypad adopts ABS construction and keys that can endure up to 50 million strokes. Mechanical switches make every word you type bouncy. USB-C connection: Very easy to set up. The macro keyboard comes with a 5.9 inches fine made USB-C cable that delivers pro-grade performance with flexibility. Simply plug this keyboard to your device via USB port and you can start the configuration according to the user manual. You can finish it within ten minutes. Programmable Keyboard: The mini 3 key keyboard is a macro keyboard, and it is equivalent to a standard USB keyboard or mouse, the keys can be configured via software as keyboard, mouse, page turner, Macro, hotkey, shortcuts, string function. The mini keypad has 3 keys so you need to program them individually. HID device, you can delete the software after configuration.