The Jensen Portable Speaker, SMPS-200, provides amazing sound in a compact form. This is because a built-in amplifier and subwoofer are included, as well as DSP bass blaster technology. The portable speaker with subwoofer has a lightweight design so it can be carried around. You can play audio files from your personal computer via a USB connection and USB cord. The portable USB speaker with built-in amp has an auxiliary input jack with a cable included that lets you play songs from your iPod or other digital audio device. The speaker requires an AC adapter or four AAA batteries to operate. Carry along a potent portable device with you when you use this Jensen speaker, and you will have strong sound at your fingertips.