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The brushed aluminium earpiece has two drivers: one balanced armature for treble frequencies, and one composite (PET material and titanium) dynamic driver for midrange and bass frequencies. As far as we know, the In-Ear Headphones IV is the only two-driver headphone around for this kind of money. Impedance is listed at 32 ohms, and the Kevlar reinforced cable has a mic and phone controls.
"I've had a chance to try out the new Mi headphones for a few days, and I have to agree with Xiaomi: these don't feel or sound like USD$30 headphones. Compared to Apple's EarPods, which sell for the same price and have similar features, the Mi headphones sound crisper and clearer and have more bass response. The metal construction is also much nicer than Apple's all-plastic headphones (or any headphones that come in the box with whatever smartphone you happen to use). I wouldn't go as far to say that the Mi headphones beat headphones costing over USD$100, but in the range of under USD$50, they are easily the best I've popped into my ears." - The Verge
"It was the look and feel of the In-Ear Headphones IV that first intrigued me -- it's a major upgrade over what I usually see in budget headphones -- but as soon as I started listening I was thrilled by the clarity. Even more than that, the In-Ear Headphones IV's bass, midrange, and treble balance was fairly accurate. These headphones told no lies. Oh, and the bass went deeper than most, if you crave high-impact bottom end, you'll love these things. The In-Ear Headphones IV's are small and light, so they were very comfortable to wear for extended periods of time." - The Audiophiliac