• All-Terrain System • IPX5-Rated (Weatherproof/Dustproof) • Full-Range, Class A/B Amplifier • (2) 4" High Power Speakers (2) 1" Soft Dome Tweeters • Aluminum Enclosure w/Internal H.D.S. (Heat Dissipation System) • Compatible w/ Audio Output of iPod®/iPhone®, Smartphones, and MP3 Players • Multi-Fit Clamp System (1.75", 2" O.D.)** • USB • USB Charging (1A)* • Aux-In • Illuminated Soft Touch Controls - Soundbar • Wireless Remote Control