Product is well built and easy to mount. Despite its sturdy construction, none of the ports are adequately filtered electronically. Consequently, if you want to keep your mp3 player charging while listening to music, forget it! The unit picks up engine noise which plays through the speakers. So, as a charger, it works perfectly and is well made but..using it while listening to music: absolutely not. 4 stars for quality, 2 stars for poor noise filtering.