Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) B-STOCK taking it with you wherever

taking it with you wherever you go

blue and red with secure attachments

* Standby: White / PCM: Red / DSD: Blue / MQA: Magenta

the AVENTHO 300 includes a 3

Note: The "Legacy" and "Evolution" versions are identical internally and they sound the same

Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) B-STOCK taking it with you whereverOver 30 years ago, Etymotic invented noise isolating, in ear earphones. Etymotics original design, developed for auditory research and hearing testing, used balancedarmature receivers and established these speakers as the true reference standard for high definition, in ear earphones. 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