VIZIO SB3821-D6 SmartCast 38-Inch 2.1 Channel Sound Bar with Wireless Subwoofer 2.1 Channel home theater solution with incredible audio performance: 100 dB of room filling, crystal clear sound with less than 1% total harmonic distortion Download the VIZIO Smart Cast app2 to turn your smartphone or tablet into a powerful touchscreen remote Simply tap the Cast button from 100+ audio apps you already know and love to start playing on your sound bar