EXTRA SUB-OUT PORT - A Sub-out port for connecting an external extra active subwoofer. Simply connect to the sub-out jack, and you'll be good to go." "DUAL RCA INPUTS - Easily connect to any devices with RCA to RCA/3.5 mm-RCA audio cable. Connect to two devices at the same time, no more plugging and unplugging. (None Bluetooth version)" "SUPERIOR SOUND QUALITY - 42W continuous undistorted power, 4-inch sub-woofer unit and 13mm silk dome tweeter unit ensure strong bass and bring more impactful sound. " "REMOTE CONTROL - Adjust volume, mute/unmute, and switch sound field extension wirelessly. Bass, treble, and volume control buttons located on the side panel." "2 YEAR WARRANTY - Guaranteed high quality and reliability with hassle-free parts and labor warranty for two years in USA and Canada.