Etymotic Research MC5 Noise Isolating In-Ear Earphones PLUS Blucoil 6-Foot Headphone Extender Highly Accurate Sound Reproduction // Noise-Isolating In-Ear Fit Multiple Types of Eartips // Replaceable Filters Kevlar-Reinforced Cable // 3.5mm Plug // Storage Pouch Included Blucoil extender: Digital quality sound transmission // Gold-plated universal 3.5mm male and female tips Secure-fit connectors // Extends the length of portable audio devices through the auxiliary cable