Sentry SPBAR 2.1 Surround Speaker System Sound Bar Incorporates three speakers; a woofer and two tweeters in the Sound Bar enclosure to give you 2.1 surround sound for your TV, computer or DVD player; micro-speaker technology; XBass woofer AUX input; 3.5mm line for audio devices like iPod and MP3 player 3.5mm headphone jack; stereo RCA line-in; powers with AC outlet Backlit rotary volume control; includes remote control; illuminated blue dial Impedance: 4ohm; frequency: 80Hz-18KHz