As one of several Plantronics Bluetooth headsets marketed towards iPhone users, the Voyager 520 ($100) uses the Bluetooth 2.0 wireless standard, a Lithium-Ion battery, and an included wall charger to offer you the ability to take iPhone telephone calls from up to 33 feet away from the phone itself. Larger in size and twice the weight of the Discovery 665, Voyager 520 is costs less, but also offers more than twice the battery life -- here, 8 hours…
