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Soho EDphone with Audio Link has a hardwired audio output for every set of headphones.
 
Let 2 students pair up when working on a laptop, or let the teacher plug in to the students Jack socket to join their music project on the keyboard.
 
You can link multiple headsets together to create an even larger private audio group.
It even has both size jack plugs on the cable ,hardwired. Goodbye splitters and adapters!