No power supply and other software required; plug and play. Compact easy to place and suitable for your desktop and office. This audio switcher is a very practical device, it has 2 in 1 out ports, you can select 1 of the sources in or 3.5mm audio input switcher, such as computer host DVD player MP3 external 1 monitor TV projector stereo headphone amplifier and other devices. The switcher supports or 3.5 mm audio jacks for transmitting high quality audio signals. This means you can enjoy clear, detailed audio effects. Switching mode: Manual button switching. Applicable equipment: Suitable for desktop computers, laptops, mobile phones, and tablets with 3.5mm or interfaces connected to headphones/audio amplifiers with 3.5mm or interfaces. With volume adjustment function, the volume can be easily adjusted, and the sound level can be controlled with one hand. With mute button, you can switch the headphones or speakers to mute with a light , which is convenient and quick. The device for home entertainment systems, conference rooms, showrooms, computer offices and many other occasions, allowing you to easily and freely switch between 2 audio devices with headphone amplification gain function to enjoy high quality audio signals. Material: Aluminum alloy colour: Black Different batches may have different appearances, which not affect the use; different lighting or displays may cause color differences in the actual product Package Contents: 2 x Audio Switcher Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.