This may not be the smallest bluetooth, but after buying 3 different brands this CERTAINLY WORKS THE BEST!!! The headset fits right in your ear, is very clear and others have no problem hearing. In fact, they are hearing me better than ever. The battery holds a good charge as well. I don't find that I have to charge it constantly.Do yourself a favor and save yourself time...this is the best one out there...buy the Plantronics Voyager 510. I purchased this after reading all the positives reviews.