Usage Tips:[2 Port 3.5mm Audio Switch] 1: Connect 2 audios to (IN/OUT)1 and (IN/OUT)2, use the 1/2 switch to an output. 2: Connect an audio to IN/OUT, select an audio output between (IN/OUT)1 and (IN/OUT)2; (The output can be switched between speakers and headphones). [No External Power Require] Just plug and play, which does not require an external power supply, allowing you to listen to music . And it 't affect the sound quality at all. Note: Only one audio is output at a time (you can switch between two audios) [One-key Mute Button] The audio selector has a one-key mute function that allows you to quickly stop playback. With this one-key mute design, it is convenient and useful under conditions, which works great for temporarily muting the sound. [Widely Compatible] The audio selector supports most of the 3.5mm audio devices, such as mobile phones, headphones, PC, MP3 / MP4, game consoles, etc. With this audio switcher, you are to and quickly switch between PC and for sound or you can switching computer audio from headphones to speakers and back as required. [Premium Material & Size] It made entirely of a durable, black metal, which has a great, solid feel and heft to it. This audio switcher is and doesn't take up a lot of real estate, which is perfect. Material: ABS colour: black Package Contents: 1 x 3.5mm Audio Switch Switcher 1 x 3.5mm Audio Cable 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.