DROK USB Volume Knob, Big PC Computer Speaker Volume Control Audio External USB Volume Control Knob with 1-Key Mute Function Support Win7 8 10 XP...

Compatible Systems: This volume control knob supports Win10/8/7/Vista/XP/Mac, once you insert it to your computer, it can start to work. Please see the video to learn more. Open a blank txt file, then short press the knob and connect to the USB port. Enter the Windows/Mac mode to programme key combination for this controller. With OTG cable, it can also work for phone Simple Operation: Rotating the usb volume knob to turn up and down volume, press the knob to make it mute, press down the knob and turning to adjust volume more quickly; keep pressing the knob for 8s, it will enter night mode, breathing light will stay on Strong Construction: DROK USB volume control is made of metal shell and ALPS rotary shaft, equipped with breathing light and come with USB cable. With 1 key mute function, when you are listening to music, just press the knob, it will stop at once and back to music when you press again 2 Sizes Available: 2 Sizes to fit different needs. The small DROK volume control