The iP4 is a re-imagining of the classic stereo boombox with intriguing updates for your iPhone and iPod. The iP4 features SRS TruBass digital signal processing technology and 5 band EQ coupled with an amp pumping 4" woofers and seperate 1" tweeters for sound that has to be heard to be appreciated. Includes FM radio and auxillary line-in jack. Works with iHome Radio app for access to thousands of internet radio stations. Operates on included AC adaptor or 6 D batteries (optional).