With a rechargeable battery that lasts up to 12 hours, a charging dock for an iPod, and a professional quality microphone, this sound system provides nonstop audio revelry at block parties, the beach, family reunions, and other special events, even when no power is nearby. The 18-watt amplifier powers an 8" woofer and 1" silk dome tweeter that can be heard clearly from 150' away. There are also inputs with independent volume controls for non-iPod audio devices such as a microphone, guitar, keyboard, or CD player, so you can sing or play along with your music or use the system as a PA. The cabinet features rugged aluminum construction, with chrome corner covers and metal carrying handles, plus a retractable luggage-style handle and two wheel s for easy transporting. The system's internal lead-acid battery charges in four hours and provides 6-12 hours of power (depending on volume), with LEDs that indicate battery level, or plugs into AC. 18" H x 15" W x 11" D. (25 lbs.)