Altec Lansing IMT320 30-Pin iPod Speaker Dock Crystal-clear sound; two full-range neodymium drivers deliver pure, distinct full-spectrum audio AC or battery-operated; blast your sound for up to 24 hours with four AA batteries or use the included AC adapter Audio Alignment technology; drivers, enclosure, and electronics are balanced for optimum sound Stylish cover folds back to double as a stand Music pause: automatically pauses music when a call is received on the iPhone