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The Jawbone Era is the best, clearest, most comfortable, and easiest to use Bluetooth headset I've used -- and it only costs $99.
Call clarity is taken care of by the military-grade NoiseAssassin 3.0 noise-cancellation and wind reduction technology. The built-in 10mm wideband speaker allows you to listen privately to music, podcasts, YouTube videos, sports, phone calls, Skype calls, and more, all in full-spectrum, high-definition quality sound.
To top all that off, the Jawbone Era supports a whole range of downloadable apps and voices.
Image source: Jawbone.