Etymotic Research ER4XR Audiophile Earphones In-Ear allowing the driver unit to

allowing the driver unit to deliver cleaner sound

the OpenComm2 revolutionizes how you connect on the go

the MMCX plug and the 3

we discovered a form that was smaller than existing ear hooks

And if you want to hear the world around you without removing your headphones

Etymotic Research ER4XR Audiophile Earphones In-Ear allowing the driver unit toER4XR is the highest performing single driver in ear monitor. The IEM shells are made of anodized aluminum, CNC machined with extremely tight tolerances. Using a single Balanced Armature (BA) driver allows for extremely accurate IEM without the added complexity of crossovers, and helps keep the aluminum body small and slim. The included high quality user replaceable cable is reinforced and twisted, to improve longevity and durability. Etymotic IEMs