1. Programmable Keypad: All keys are programmable. All standard keyboard functions can be customized, and complex shortcut combinations can be assigned to a single key. 2. Compact design saves desktop space. Features a detachable USB cable. The keypad can be used simultaneously with another keyboard on the same computer without interference. 3. Wide range of applications: Suitable for office use, gaming, music, media control, industrial control, laboratory, and production line testing. Ideal for professionals such as designers and video editors. 4. Type-C to USB interface, no driver required, plug and play. 5. Keys support complex operations, ideal for office, gaming, music, media, and industrial control. Mechanical key switches with ergonomic design. Supports hot-swappable switches. Operating Systems: Windows, Vista, Linux Keys: 4 Knob: No knob on 4-key model Current and Voltage: DC 5V/1A Interface: Type-C Switch Type: Outemu Red Product Weight: 58-68 grams Note: The 4-key keyboard does not include a volume knob. Operation Style: Mechanical Language: English Type: Wired Application: Laptop Keyboard Standard: Mini Keyboard Interface Type: USB Color: Black Material: Acrylic Package Contents: 1 x Mini Custom Keyboard 1 x USB Cable Note: Light reflection and differences in display screens may cause slight variations between the color shown in the image and the actual product. Measurement may vary by +/- 1-3 cm.