Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) cable not detachable Stealth Magnets technology for acoustically

Stealth Magnets technology for acoustically invisible magnets

And if you still need more

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

and helps keep the aluminum body small and slim

Etymotic ER4 XR Noise-Isolating Earphones with Etymotion Wireless Bluetooth Cable (Open Box) cable not detachable Stealth Magnets technology for acousticallyOver 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