Dynamic driver with improved bass,the se215 is the entry to shure se earphones. It features a dynamic driver for a detailed,warm,sound with improved bass. Sound isolating design,sound isolating earphones were originally developed as personal monitor systems to allow musicians to hear their own performances in loud onstage environments. They work by using soft,flexible sleeves to block up to 90 % of the background noise. You can concentrate on your music,whether you are on-stage,in a train,on the street or working out. At the same time you can reduce the audio level to conserve your hearing. Detachable cable with wireform fit,the se215 features a durable kevlar"¢ reinforced cable that allows easy replacement or customisation. The formable wire ensures secure placement,and over the ear configuration keeps cables out of the way. The gold plated mmcx connector has a lock-snap mechanism allowing 360 degree rotation for comfortable fit. An assortment of sleeves for individual fit,because every ear is different,the fit kit includes an assortment of foam and silicone sleeves in different sizes. Experiment with the size and style that creates the best fit for you. A good seal is key to optimizing sound isolation and bass response as well as maximizing comfort during extended wear.