<b>Features:</b><br> 2-IN-2-OUT (switch audio sources) <br> Input (3.5mm) connections: Computer / Phone / Music player. etc.<br> Output (3.5mm) connections: Active speaker / Headphone / Amplifier. etc.<br> High quality volume control knob; Smoothly control the volume <br> Mute button; Mute the device with just one key; Very useful for special conditions<br> A / B, 1 / 2 both select button; Can conveniently select the device you want to use as the audio input or output<br> No power and additional software required<br> Hot-swappable (no need to reboot devices)<br> Compact and super mini size; Easy to place and suitable for your desktop and office<br> <br> <b>Parameters:</b><br> Interfaces: 4 * 3.5mm jack<br> Knob and key: 1 * volume knob; 1 * A/B selector; 1 * mute botton,1 * 1/2 selector<br> Dimensions: 3.23 * 2.17 * 0.79 in<br> Weight: 0.22 lb<br> <br> <b>Packing List:</b><br> 1 * audio selector (without audio cable)