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The Sennheiser PMX 684i In-Ear Neckband Sports Headphones for iOS Devices combines quality sound with a headset specifically designed for the modern athlete who works out at the gym or runs outdoor, cross-country races. The headphones deliver a full range frequency response of 18 Hz to 20 kHz into a 28 Ohms load. They feature an in-line remote control with an omnidirectional microphone, which enable you to manage media and make calls on iOS mobile devices.