Bi-directional 3.5 mm audio switch: the audio switch can be input from 2 sources and 1 output, or 1 input and 2 outputs, supporting bi-directional transmission. Select one of the audio sources or outputs to avoid frequent plugging and unplugging. It is very convenient to switch between different audio sources or select between different outputs. You can use it to debug or compare your different audio devices. (Note:Only one audio speaker can be output at a time, not both) Volume adjustment and one-key mute: the audio switcher uses toggle buttons to select different audio inputs or outputs, and you can easily adjust the volume of your device using the volume knob. The audio selector has a key mute function that allows you to quickly stop playback. (Note: NOT a Splitter, Only One Input Can Be Played At a Time) No power supply required: the audio switch is a passive and non-powered device, no external power supply, simply plug and play and the sound quality is not affected. You can easily listen to music, this is the for speakers and headphones to switch to listening. Metal shell: Aux switch designed with metal housing to heat dissipation and electromagnetic compatibility. Strong and , extend the life of the product. Using high quality audio cable, the input transmission distance can reach 8 meters and the output transmission distance can reach 8 metres. Extensive compatibility: the 3.5 mm stereo audio switch is compatible with all 3.5 mm audio output devices. For example, mobile phones, laptops, computers, MP3, MP4, headphones, active speakers, etc. Product parameters: 1) 1 in 2 out or 2 in 1 out analog audio switch 2) No power supply operation 3) With mute function 4) Support key switching Color:Black Material:Metal Package Contents: 1 * Audio Switcher 1 * 3.5 au cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.