Bluetooth headsets can be a bit of a hassle—particularly if you're looking for a set that makes calls and plays music. Sure, you can buy a pair of stereo Bluetooth headphones, but unless they have a built-in mic, you'll have to remove them each time you make or receive a call. On the other hand, headphones that do have a mic—such as the Plantronics 590—are usually too bulky to wear all the time. Plantronics went back to the drawing board and came up with the Voyager 855, a Bluetooth headset with a surprise: a second, detachable earpiece for music. The Voyager 855 also packs in other niceties, such as AudioIQ sound enhancement, a sliding boom mic to better pick up your voice, and a sleek design. The result: the Voyager 855 is a good mono headset, but it disappoints in stereo mode.