The PWMA1090UI is a portable PA/mobile entertainment system on wheels. It's equipped with an iPod dock connector that charges your iPod or iPhone and lets you play your favorite music over the powerful 800 watt speaker. It has four " inputs on the front, each with its own volume control, for a total balance of sound. You can also connect any other digital music player using the retractable 3.5mm cable, listen to AM/FM radio, and plug in an SD card or USB stick to listen to MP3 and WMA files. And this unit can be totally wireless - it runs on a rechargeable battery for up to 5 hours of life and includes a two microphones, a wireless handheld mic and a wireless lavalier microphone. It all plays through our powerful 10" three-way speaker including a woofer, mid-range, and tweeter for full-range sound. Tweak your sound using the bass and treble controls, and apply an effect with the echo knob. The telescoping handle and caster wheels make transportation simple and easy. Runs on 110 V or 220 V.