Rock with the Block | The iBT44 is a re-imagining of the classic stereo boombox with intriguing updates for Bluetooth. The iBT44 features SRS TruBass digital signal processing technology and 5 band EQ coupled with an amp pumping 4" woofers and 1" tweeters for sound that has to be heard to be appreciated. Aux-in jack with included audio cable. Operates on 6 D batteries or included AC adaptor. USB port to charge devices.