All Bluetooth headsets are not equal -- not just in price (from around ten bucks to nearly $200) and features, but also in terms of usability. Some of these differences may be absolute, some may be a matter of YMMV (Your Milage May Vary). Things to look for 1. Uses a USB port (and cable) charging, nothing proprietary in the headset-side plug. The charging port on the headset must be a standard USB port (micro or mini). (The other end should be a standard USB plug, which lets you charge from a powered USB port on a...