Featuring Hi-Definition MicroSpeakers plus Tuned BassPorts, the Shure SE310 delivers extended range audio for optimal high frequencies and enhanced low-end performance. The Shure SE310 also provides enhanced bass.Evolved from in-ear monitor technology pioneered by Shure for pro musicians, the SE310 uses premium Hi-Definition MicroSpeakers plus Tuned BassPorts to deliver stunning audio quality. The sound isolating design blocks most background noise. This translates into even greater depth and accuracy. Shure earphones can turn a basic MP3 player into a high performance audio machine, just like good speakers work wonders with your home stereo system. Sound isolating earphones were originally developed as Personal Monitor Systems to allow musicians to hear their own performances in loud onstage environments. Sound isolating earphones work by using soft, pliable sleeves to block background noise, allowing small, high-performance drivers to deliver incredibly precise sound directly to the ear.