The new ER2XR with Etymotion Bluetooth delivers clear, accurate sound using high performance dynamic drivers. The ER2XR with Etymotion Bluetooth offers Etymotics renowned isolation featuring a variety of eartips to provide 35dB of noise reduction so you will hear all the detail buried in the mix without raising the volume to compensate for ambient noise. Its perfect for the mobile audiophile. Paired with the new Etymotion Wireless Bluetooth cable these earphones are unstoppable and sound better than anything else on the market today. With built in functionality to answer calls, play/pause, and change tracks its the ultimate in audiophile portability.