• All-Terrain System • Full-Range, Class A/B Amplifier • (4) 4" High Power Speakers (2) 1" Soft Dome Tweeters • Aluminum Enclosure w/Internal H.D.S. (Heat Dissipation System) • Aux-In • Compatible w/ Audio Output of iPod®/iPhone®, Smartphones, and MP3 Players • Multi-Fit Clamp System (1.75", 2" O.D.)** • USB • USB Charging (1A)* • Soft Touch Controls • Wireless Remote Control • IPX5-Rated (Weatherproof/Dustproof) • BLUETOOTH® v5.0 w/Simple Pairing • Bluetooth® Audio & Control (A2DP & AVRCP) Stream and Control • your Favorite Music APPs • Built-in DSP with Preset EQs (works in USB and BT mode, not work in Aux in)