Usage Tips:Features: Application: use it for watching videos, playing games, even will be the best volume controller for various activities, wedding, celebration, meeting, performing and etc. Supports for Win10/8/7/Vista/XP/Mac. Small and delicate, aluminum case, CNC machining process, gold-plated pins, made of metal shell and ALPS rotary shaft. 3.5mm audio in, connect tablet PC, computer, phone, audio player. 3.5mm audio out, connect power amplifier, active speaker, headphone amp. Simple and easy to use, just insert it into your computer, then it will start to work; If you use it with an OTG cable, it can also work for the phone. Mini portable, lightweight, can be taken with you at any time to use, saving space. Specifications: Item Type: Volume Controller Material: Aluminum Color: Black Package Size: Approx.9*7.5*5.5cm / 3.54*2.95*2.17in Package Weight: Approx.88g / 3.1oz Package List: 1 * Volume Controller 1 * User Manual