Sound isolating and unobtrusive Shure earphones are designed specifically for use with Shure PSM systems and deliver the incredible sound and performance that ear buds and other headphones simply can't. Don't go In Ear without them.Along with their high fidelity, full-bandwidth transducers, the natural design of these stereo earphones allows them to rest comfortably in the ear, providing a tight seal for sound isolation and a snug, secure fit. Shure Sound Isolating Earphones can be used with a variety of foam, flex, or triple flange accessory sleeves to get a personal fit tailored to your ears. The universal 3.5mm (1/8 in.) plug connects to Shure's PSM body pack receivers, as well as many other personal audio applications where high fidelity is deemed appropriate.