The revolutionary Ultimate Ears UE Pro Sound Tap Personal Monitoring System is the simplest and easiest way to take a stage mix and "tap" it for use a headphone mix. It sits between any mixing board or speaker and supports both line-level and speaker-level inputs. It will not affect anything in the signal path as its completely neutral. You simply plug in, adjust the volume and go. The UE Pro Sound Tap includes 2 9v batteries, a 6' XLR cable and a 6' 1/4" cable to get you up and running quickly.