Etymotic Research ER4XR Extended Response Precision Matched In-Ear Earphones

  

Etymotic Research ER4XR Extended Response Precision Matched In-Ear Earphones (Detachable Balanced Armature Drivers, Noise Isolating, High Fidelity, World Leader Response Accuracy), Black, Standard. Etymotic Research ER4XR Extended Response Precision Matched In-Ear Earphones.