3.5mm Stereo Audio Switcher: Bidirectional switching splitter for sharing audio between active speakers and headphones. Method 1: Connect two audio devices to (IN/OUT)1 and (IN/OUT)2, use the 1/2 switch to select output. Method 2: Connect an audio source to IN/OUT, then choose output between (IN/OUT)1 and (IN/OUT)2; output can be switched between speakers and headphones. One-key mute function for quick and convenient operation, ideal for practical use in various scenarios. Plug and play design with no external power required; does not affect sound quality. Color: Black Material: Plastic Package Contents: 1 x 3.5mm Audio Switcher 1 x 3.5mm Audio Cable Note: Only the items listed are included. Lighting and display differences may cause slight color variations between the image and actual item. Measurement error allowed within +/- 1-3 cm.