Point Source Audio CM-i3-4F - Dual In-Ear Intercom Headset (4-Pin XLR Female)4 pin female XLR for all Clear Com compatible systems. The CM i3 is the world's first modular intercom headset. This intercom headset has a patent pending slim line design that allows for three listening modes.Rather than having to remove the entire headset to check environmental sounds or interact with others, simply remove one or both earphones to exit the listening mode or monitor a mix of feed audio and surrounding acoustics.The CM i3 intercom