Usage Tips: [2 Port 3.5mm Audio Switch] Method 1: Connect 2 audio devices to (IN/OUT)1 and (IN/OUT)2, use the 1/2 switch to select output. Method 2: Connect an audio device to IN/OUT, select output between (IN/OUT)1 and (IN/OUT)2; (Output can be switched between speakers and headphones). [No External Power Required] Plug and play design requires no external power supply, allowing easy music playback without affecting sound quality. Note: Only one audio source is output at a time (switchable between two sources). [One-key Mute Button] The audio selector features a mute button for quick playback stop. This one-key mute function is convenient and useful for temporarily silencing sound. [Widely Compatible] Supports most 3.5mm audio devices such as mobile phones, headphones, PCs, MP3/MP4 players, and game consoles. Easily switch audio between PC and Mac, or toggle computer audio between headphones and speakers as needed. [Premium Material & Compact Size] Made of durable matte black metal with a solid feel. The compact design saves space and is ideal for everyday use. Material: ABS Color: Black Package Contents: 1 x 3.5mm Audio Switch 1 x 3.5mm Audio Cable Only the above package content is included; other items are not part of the package. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.