Functions: Application: Use it to watch movies, play games, and it will even be the best volume controller for various activities, wedding, celebration, meeting, performance, etc. Supports Win10 / 8/7 / Vista / XP / Mac. Small and delicate, aluminum housing, CNC machining, gold-plated pins, made of a metal shell and ALPS rotary shaft. 3.5mm audio input, connect tablet PC, computer, phone, audio player. 3.5mm audio output, connect a power amplifier, active speaker, headphone amplifier. Simple and easy to use, you just need to insert it into your computer and then it will start working; If you use it with an OTG cable, it can also work with a phone. Mini portable, lightweight, you can take it with you at any time, saving space. Technical data: Item Type: Volume Control Material: aluminum Black color Package Size: About 9 * 7.5 * 5.5cm / 3.54 * 2.95 * 2.17in Package weight: approx. 88 g / 3.1 oz Package List: 1 * volume control 1 * User Manual