[2 Port 3.5mm o Switch] 1: Connect two o sources to (IN/OUT)1 and (IN/OUT)2, use the 1/2 switch to select one output. 2: Connect an o source to IN/OUT, select an output between (IN/OUT)1 and (IN/OUT)2; (The output can be switched between speakers and headphones). [No External Power Required] Plug and play design requires no external power supply, allowing you to listen to music easily without affecting sound quality. Note: Only one o source is output at a time (you can switch between two sources). [One-key Mute Button] The o selector features a one-key mute function that allows you to quickly stop playback. This mute design is convenient and useful for temporarily silencing sound. [Wide Compatibility] The o selector supports most 3.5mm o devices, such as mobile phones, headphones, PC, MP3/MP4 players, game consoles, etc. With this o switcher, you can easily and quickly switch between PC and other devices for sound, or switch computer o from headphones to speakers and back as needed. [Premium Material & Compact Size] Made entirely of durable black metal with a solid feel and good weight. This o switcher is compact and saves space, making it ideal for everyday use. Material: ABS Color: Black Package Contents: 1 x 3.5mm o Switch 1 x 3.5mm o Cable Only the items listed above are included; other products are not included. Note: Light reflection and different displays may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3cm.