• Built-in Full-Range, Class D Amplifier • Bluetooth® Audio Streaming Stream and Control your Favorite Music APPs • Compatible with Audio Output of iPod®/iPhone®, • 4" (102 mm) Chrome Speakers (1 Pair) • Aux-In • IPX-5 Rated Speakers > Not Submergible > Weather Resistant • In-line Volume Control • Adjustable Brackets • Compact Amplifier