Features: 1.Bring You Convenience: 4 key keyboard, which can set all the key functions on the standard for Windows keyboard, with adjustment knob, user defined, and support up to 18 character shortcut key superposition. 2.Delay Setting: The delay function can be set to 6000 milliseconds at most. For example, you can choose to delay 200 milliseconds and set other commands after setting the copy and paste button 3.Knob Can Be Set: The knob has a click function, which can be used as the left and right mouse buttons. It can also be set to zoom in and out, play the previous song, the next song, volume up, volume down, pause, play and other functions. 4.With RGB and Easy to Use: Mini keyboard with customized function, Type C to USB interface, plug and play without driver, with RGB function, and various light colors can be adjusted. 5.Storage Function: The keyboard has storage function, which can be used on systems such as for Linux and for OS X that support USB protocol after being set on for Windows system. 6.Applicable Scene: Programmable keyboard is applicable to office, games, music, media, industrial control, laboratory, production line testing and other fields. Specification: Item Type: One Handed Mechanical Keyboard Material: Acrylic, PCB Purpose: Applicable to office, games, music, media, industrial control, laboratory, production line testing and other fields System Support: For Windows, for VISTA, for Linux, for OS X Key Life: Up To 50 Million Times Type: Dustproof Blue Switch Lights: Adjustable RGB Number of Keys: 4 Keys Connection Mode: Wired, Bluetooth Battery Type: 500mAh Lithium Battery x 1 (Built in) Size: Approx. 123 x 33 x 38mm / 4.84 x 1.3 x 1.5in (L x W x H) Current And Voltage: DC 5V, 1A Working Temperature: - 10 -50 PackageList: 1 x Keyboard 1 x USB Cable 4 xSiliconePad Note: 1. This software can only be run on for Windows system for the time being. Try to download it on the PC side of the computer. The setting software does not need to be installed. It can be run directly when opened. After setting, it will be automatically stored on the link disk, and then plugged into systems such as for Linux and for OS X that support the USB protocol for use (the first time you run it, pay attention to the release of antivirus software and set it as a trusted file)! 2. For software download problems, you can send a letter to customer service, who will help you solve the software download problem!