Philips AZ4000 CD Boombox with MP3 CD Playback Audio CD-R/CD-RW and MP3 CD compatibility, digital FM/AM tuner with 30 station presets and auto tuning 20-track CD programming, repeat and shuffle play; firmware upgradeable 3-band equalizer and Ultrabass 2 bass boost enhance and customize system sound quality 2-way speakers with 4-inch woofers, dome tweeters, and bass-reflex cabinets Runs on 6 D batteries (not included) or AC power (cord supplied)