2 large full-range 4" speakers deliver crisp clean audio with undistorted powerful bassMaximum portability with spring-loaded pop-up handle and option to play wirelessly with batteriesDock connector insert keeps iPod securely in place patible with all dockable iPod sAuxiliary line input for any audio device with 3.5mm jackWireless remote controls basic function of iPod and stores in the back of the speaker system15 1/2" W x 7 1/16" H x 4" D weighs 5.5 lbs.Requires 8 C batteries (not included) or AC power adapter (included)Includes 4 iPod dock inserts and I/R remote control