This kind of looks like an earplug but rather than keep sound out it funnels it directly into your ear. The Argard bluetooth headset is smaller than a quarter and weighs only 5 grams. If you are one of those people that find it necessary to walk around with a bluetooth headset always in your ear then you might be able to get away with doing it discreetly with this one

Available for $149 here

-via Uncrate