The Nextar NXBT-001 and NXBT-002 denote the model names of a pair of BlueTooth handsfree kits for the car. The eco bit is that they are both solar powered rather than using the charging port of the car. The Nextar NXBT-001 offers 250 hours of standby time and 10 hours of talk time, whereas the Nextar NXBT-002 offers 150 hours of standby time and 6 hours of talk time. Clearly the charging time of both units depends on how bright the sun is that day.
The Nextar devices use Bluetooth 2.0 technology, therefore providing up to 30 feet of hands-free capability from your phone. Both devices feature a caller ID display, and are surprisingly only priced at $59.99 (for the NXBT-001) and $69.99 (for the NXBT-002).
Perhaps not so appropriate for climates where bright sunshine is a rare commodity. e.g. the UK.
Source: engadget