Etymotic ER4-XR Earphones Extended Response

The Etymotic ER4-XR Earphones Extended Response deliver the highest response accuracy of any in-ear headphones with the extra low-end enhancement for users who love bass. Offering nearly 100 percent noise isolation the ER4-XR Earphones block out most sounds and completely seal the ear meaning you can reduce the risk of listening at unsafe levels. With a professional and reliable build the Etymotic ER4-XR Earphones are guaranteed to last.