Fusion Entertainment was one of the first to create a watertight dock for MP3 devices and smartphones, and it has kept up with changes in connections and dimensions, offering extremely versatile systems. Bluetooth capable, these Fusions integrate Pandora's thumbs-up or down functions, and they can be operated via smartphones with an app. Waterproof to IPX5, they can take three minutes of a 6.3 mm water jet from 360 degrees without harm. If you're ready to upgrade, they fit the same footprint as the 500/600 models. They support four separate audio zones and a DVD dock that turns your NMEA 2000 multifunction display into a video center.