Mini 4 Key Gaming Keyboard Mechanical Keypad Type C to USB Interface Programming Black with RGB Light Item Type: 4 Key Keyboard Material: Acrylic + PCB Application: Office, games, music, media, industrial control, laboratory, production line testing and other fields. Lighting: RGB System Support: for Windows, for VISTA, for Linux, OS X Button Life: Up to 50 million times Type: Dustproof green shaft Number of Keys: 4 Keys Product Size: Approx. 100x35x30mm/3.9x1.4x1.2in Working Temperature: -10℃ to 50℃ How e: 1. Open the custom software on the computer. 2. On the custom software, click (yellow area) Key Setting area or Knob Setting area and then click the keys KEY1-KEY12 to be set or any key of Knob 1 or Knob 2 (green area); Displays red. 3. Click the function button corresponding to the simulated keyboard on the custom software, click download, and it will prompt that the download is successful, and our custom small keyboard can be used. For example: I want to set the keyboard key 1 as a shortcut key for copying (Ctrl+C), click Key Setting Area on the software, click KEY1 and then click Ctrl and C on the software to simulate the keyboard, click Download, and it will prompt that the download is successful. Common Problems and Solutions: Question 2: After downloading the custom software, it cannot be opened. Solution: Check whether the security software is blocking the operation, and set it as a trusted file. Question 3: Why is the key or knob always A after connecting to the computer? Solution: Output A is the normal factory setting, just open the custom software to redefine the button function. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store