AudioStix from Switchcraft® can be used as stand-alone adapters, rear mounted into modular rack panels, or permanently installed into any number of custom racks and wall plates. AudioStix are made in the USA.The Switchcraft #318 Mini AudioStix lets you connect the audio output of your laptop or MP3 player to a PA system. You won't have to worry about hum and buzz caused by ground loops and RF interference, either, as the 318 has transformer isolation. You also get a handy volume control and a ground lift for killing the noise you sometimes encounter with consumer devices. Your presentations will ring out with crystal clear sound - making you look like the consummate professional you are!