Plantronics makes some of the most popular Bluetooth headsets around, and their newest Discovery 655 keeps up that tradition. The coolest feature of the discovery 655 is its small size.

Small size and light-weight of only 9 grams makes the earpiece comfortable to wear without the need for the ear security strap to keep it in place. Sound quality and talk time is top notch as well.
Review excerpt: "The headset itself is a very small and compact unit that weighs a mere 9 grams. I could wear the headset all day without any problems or fatigue. The coolest part about the light-weight of the headset is that I could wear it without the ear loop with no fear that it would fall out of my ear. Talk time is superb at 3.5 hours continuous and if you place the headset into the AAA charger between calls you can stretch talk time out to 10 hours." Read the full review here.