Enhanced, Portable Sound For MP3, CD, And Other Portable Audio Players You"ve got a CD player, an MP3 player, and a portable DVD player, but until now you were the only one listening. Introducing the Altec Lansing inMotion iM4 portable audio system. This tiny, portable, battery-operated stereo system lets you share the sounds at home, at the beach, on the go... where ever. A highly efficient Class D amplifier powers four full-range micro drivers to deliver a full spectrum of pure, distinct sound, while the revolutionary MaxxBass™ technology allows listeners to enjoy deep bass without lugging around a subwoofer. Place your small portable audio device on the rubberized base, plug in the retractable audio cable, and fire up your system. It" s great sound that everyone can enjoy.