The Logitech mm50 Portable Speakers for iPod utilize 3-inch pressure drivers to maximize bass and minimize distortion, creating the full experience of home audio for life on the go. The use of 3-D sound processing also widens the stereo effect, so that this system's sound seems to come from an area about two feet wider than the speakers themselves. The speakers are powered by an AC adapter or rechargeable Li-ion batteries, come with a credit card-sized wireless remote, and are easily compatible with all docking iPods. If you don't have an iPod with a dock connector, just use the auxiliary outlet.