Designed specifically for use with Shure PSM systems, Shure earphones deliver the incredible sound and performance that ear buds and other headphones can't. Don't go In Ear without them. SCL Sound Isolating? Earphone models use award-winning earphone technology from Shure. All SCL models deliver professional caliber sound for live performance environments and will work with personal music players. The SCL5s feature dedicated high-definition tweeter and woofer drivers couple with an inline crossover to deliver exceptional audio: precision highs, natural mids, and full bodied bass with clarity often difficult to detect with traditional stage wedges or studio headphones. The choice for discriminating professionals.