One thing that Bluetooth handsfree kits have in common is that you need to replace batteries or charge them. That can be tedious, especially if you live in a state where hands free kits are required and yours goes dead while driving.

A company called Iqua has a new Bluetooth handsfree kit that promises to provide unlimited talk time called the Iqua VizorSUN. The device gets power from a solar panel on the back of the gadget. In optimal light conditions, the maker says it will work indefinitely.