AudioFly - AF180 Universal In-Ear Monitor - Stone Blue Jam-packed with a quartet of armature drivers, this workhorse is geared for unparalleled speed and clarity. We're talking superb, dependable accuracy; it's the only friend you'll need on stage. They are equipped with a variety of different Comply foam ear tips for assured comfort, accommodating the contours of your ear shape and your preferred tightness. They also include a storage pouch, a 1/4 in. headphone jack adaptor, an airline adaptor, a shirt clip, and a cleaning tool. Configuration: 4 x balanced armature drivers with crossover (per channel) Frequency Range: 15 to 25,000 Hz Built-In Crossover, 15 to 25,000 Hz Frequency Response