I'm in the passenger transport operates and have bought these speakers a few weeks ago to bring music into the vehicles without radio, and am completely satisfied. The small device has Surprisingly enough power to entertain a large Mercedes Sprinter. These speakers are very fuel efficient, the supplied batteries acknowledged only after 3 weeks in service - with a daily use of about 4 hours! The volume remains constant even loud until the batteries are really empty, and not taking about slowly over time. The sound quality is very good and amazingly balanced, especially if you put the unit directly under the windshield, which enhances the bass again. All in all, a very worthwhile investment, ideal for my application.
