1.3.5mm Audio Switcher: bidirectional 3.5mm stereo audio switch allows you to connect 2 audio input sources (MP3/PC) to one audio output (Headphone); or connect one audio input source to 2 audio output (Headphone/Speaker). You can easily select the audio input source or audio output at a switch button, avoiding frequently plugging and unplugging causing damage to the device. NOTE: 2 audio output NOT play the music at the same time. 2.Bidirectional Audio Switch 2x1/1x2: This 2 way 3.5mm audio selector can be used in reverse, only can be play the music. Designed for friends with multiple audio sources and outputs. 3.One Key Mute and Volume Knob: Our this 3.5mm audio switcher mic has a key mute function, which can quickly stop the music, to pause the music in case of emergency to silence the surroundings, so convenient and useful in some special situations. Also has an volume control button, so you can adjust the volume of the input source at you want, give you a enjoyable music listening experience. 4.Wide Compatibility: 2 port aux stereo audio switcher can support most of 3.5mm audio devices. Audio input source: for Android phones, MP3, MP4, PC, Game Console, Laptop, Blu-ray Players etc. Audio Output: Speaker, Soundbar, Headphone. No need external power supply. Only for Three-segment Headphones, NOT for Four-segment Headphones! 5.This audio switch 3.5mm is small and compact design, build in solid aluminium shell, looks textured and , very suitable for your desktop and office, make listening to music more enjoyable. Color: Black Material: Metal Package Contents: 1 x Audio Switch Selector 1 x Audio 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.