Feature:1. High Compatibility: The keyboard has a storage function, which can be used on systems such as for Linux, OS X, etc. that support the USB protocol after setting it up on the for Windows system.2. Wide Range of Uses: Mini 4 key keyboard is widely suitable for office, games, music, media, industrial control, laboratory, production line testing and other fields.3. 4 Key Design: The dust proof green axis keyboard with 4 customizable shortcut keys, easy to operate, no conflict when connecting multiple keyboards, improve work efficiency.4. Plug and Play: The mini mechanical keyboard with custom functions is designed with a Type C to USB interface, no driver required, plug and play, convenient and fast.5. Cool Appearance: Black keys, simple and elegant, with RGB lights, embellish your cool keyboard. Small and lightweight, easy to carry, take up hardly little space.Specification:Item Type: 4 Key KeyboardMaterial: Acrylic + PCBApplication: Office, games, music, media, industrial control, laboratory, production line testing and other fields.Lighting: RGBSystem Support: for Windows, for VISTA, for Linux, OS XButton Life: Up to 50 million timesType: Dustproof green shaftNumber of Keys: 4 KeysProduct Size: Approx. 100x35x30mm/3.9x1.4x1.2inCurrent and Voltage: DC 5V/1AWorking Temperature: -10 to 50How to Use: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 1: There is no response when the keyboard is connected to the computer, or the device is prompted abnormally. Solution: Check whether the cable and interface have been connected, and re plug; replace the USB interface on the computer and re plug it.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..Package List:1 x4 Key Keyboard1 x USB cableNote:This software can only be run on for Windows system temporarily, try to download it on the PC computer, the setting software does not need to be installed, it can be run directly after opening it, and it will be automatically stored on the chain disk after setting, and then plugged into the USB protocol such as for Linux, OS X and other systems (for the first time, pay attention to the security software to be released, and set it as a trust file).