Features Docking mechanism for use with original iPod(r) USB of fire wire cable for synchronization and charging capabilities 9 docking spacers for all iPods(r) Compact design for mobile use Dual, full range neodymium drivers per channel, suitable for iPod(r)/iPod(r) photo, iPod(r) mini, MP3/CD, PC/MAC Total power output: 12 watts RMS 32mm full range speaker 4ohm Frequency response: 180Hz - 20kHz Metal grill for added durability AC powered (AC adapter included) Battery powered (4 "AA" batteries) not included Blue LED power indicator Power on/off button Digital volume control Bass enhancement button Includes external audio cable for more compatibilities