Used Iogear Solar powered Bluetooth speaker phone for sale at only $40. (bought $80 few months back)

Powered by solar power so there's no charging or wires required, simply attach to windscreen via suction cups and you are good to go.

Excellent echo cancelletion and superior sound quality

Allows multi phone connections so u can switch between 2 phones with pairing again.

Bluetooth 2.1 +EDR provides easy pairing and robust signals

Dedicated volume and mute buttons