Open Box - Never used.

Ultimate Ears’ Pro Sound Guard is a small, battery-powered audio protection device made to go in-line with your set of balanced armature in-ear monitor earphones. It is a pre-set compressor/limiter module designed to control the absolute maximum sound level your ears could ever experience when using in-ear monitors. Sound Guard will suppress instantly the damaging sound spikes that occur from accidental microphone drops, audio feedback squeals and other unexpected sound hazards that may occur while performing or recording.

For on-the-body personal use, Sound Guard has a removable belt clip and runs on two, three-volt CR2450 lithium batteries (included). It also comes with a short TRS-to-TRS patch cable to connect it to your in-ear receiver.