Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) cable not detachable when you make unnecessary movements

when you make unnecessary movements to break in a pair of shoes

and helps keep the aluminum body small and slim

002% (20-20kHz) What's in the Box

WIMA capacitors from Germany

99% pure cryogenically treated silver wire construction

Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) cable not detachable when you make unnecessary movementsOver 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