ER4XR Extended Response Earphone Type_Ear Plugs Made of proprietary memory foam

Made of proprietary memory foam material

39″ USB charging cable (Type A USB on one end and Micro-B USB on other end)

a children’s ear can tolerate even less sound than an adult ear

allowing your inner-ear time to adjust to the changes in pressure experienced while flying

ER4XR Extended Response Earphone Type_Ear Plugs Made of proprietary memory foamER4XR 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