[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 that allows quick playback interruption. This mute button is convenient for temporarily silencing o when needed. [Widely Compatible] Supports most 3.5mm o devices such as smartphones, headphones, PCs, MP3/MP4 players, and game consoles. Easily switch o between PC and other devices, or toggle computer o between headphones and speakers as needed. [Premium Material & Size] Constructed entirely of durable black metal with a solid, high-quality feel. Compact design 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 different display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.