[2 Port 3.5mm o Switch] Connect two o devices to (IN/OUT) 1 and (IN/OUT) 2, then use the 1/2 switch to select one output. Alternatively, connect one o source to IN/OUT and choose between outputting to (IN/OUT) 1 or (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 enjoy music without affecting sound quality. Note: Only one o source is output at a time; you can switch between the two inputs. [One-Key Mute Button] The o selector features a one-touch mute function for quick playback stop. This mute button is convenient and practical for temporarily silencing o. [Widely Compatible] Supports most 3.5mm o devices such as smartphones, headphones, PCs, MP3/MP4 players, and game consoles. Easily switch o between devices, such as from PC to mobile or between headphones and speakers as needed. [Premium Material & Size] Constructed of durable black metal with a solid, high-quality feel. Compact size saves space and is ideal for desktop or portable use. Material: ABS Color: Black Package Contents: 1 x 3.5mm o Switch 1 x 3.5mm o Cable Note: Light reflection and display differences may cause slight color variation between the image and the actual item. Measurement may vary by +/- 1-3 cm.