DUAL CHANNEL AUDIO SWITCHING - Passive 2-channel AB switcher lets you toggle between two audio sources or outputs without batteries or power UNIVERSAL 3.5MM COMPATIBILITY - Works with headphones, speakers, phones, tablets, computers, gaming devices, and all standard 1/8 inch audio equipment COMPACT MINI DESIGN - Small portable form factor perfect for desktop setups, work from home audio switching, and streaming configurations INSTANT ON/OFF SWITCHING - Simple toggle operation for quick audio source selection with no delay or signal loss PROFESSIONAL AUDIO QUALITY - Maintains stereo sound integrity with TRS jack compatibility for clear, uninterrupted audio Here is a stereo audio AB switch for 3.5mm (1/8") plugs that have three contacts on them. Send your audio to output #1, output #2, or neither if you put the switch in the middle position. (The switch on top has three positions and can be used as an audio on off switch.) This A B channel on/off selector can be used backwards too. Send in your two audio signals and switch to the one you want to come out the middle jack. You can let input #1 come out, input #2 come out, or nothing comes out. The switch is built inside a tough ABS box that is screwed together. The audio jacks have brass contacts which resist corrosion over time. This item measures 50mm x 35mm x 15mm thin (2 x 1 3/8 by 5/8 inches) and weighs 15 grams (0.53 Ounces). No batteries required. The audio cables are not included so be sure to get the right lengths you need. This item is packaged very simply, in a heavy gauge zip-lock type bag to reduce environmental waste and extra cost. Any questions both before and after purchase can be answered by contacting the seller directly through Amazon.