Etymotic Research hf3 Noise-Isolating In-Ear Stereo Headphones with Mic (Ruby)

The hf3 in-ear headphones from Etymotic Research provide high-quality performance in a compact and affordable package. The headphones feature precision-matched Accu·Driver balanced armatures to provide a better than 85% response accuracy with tight bass, clear treble, and an extremely high output sensitivity. User-replaceable ACCU·Filters protect the drivers from earwax and other debris to ensure lasting quality and clarity. The in-ear design and assortment of noise-isolating ACCU·Fit eartips provide a proper seal in the ear canal to reduce outside noise by 35-42dB. A CUSTOM·FIT option is also available that allows you to purchase custom-made eartips that are specifically designed for your ears.