The Hisonic MVP2010 is a 50 watts wireless, portable & rechargeable PA (Public Address) system with built-in DVD player, 7" Color LCD display & and a Dual UHF wireless microphones.It is an invaluable tool for teaching, presentation and public speaking. It can be used both indoor, such as conference rooms, meeting rooms or auditoriums, and outdoor for an audience of up to 500 people. For indoor use, use the power cord and simply plug it into a wall outlet; for outdoor use, the system runs on one 18V/10Ah Lead-Acid rechargeable battery, which can last well over 8 hours of continuous use. This system comes with a 7" TFT LCD display to be used along with its built-in CD/DVD player which supports a variety of formats including DVD, CD, CD-R, MP3 and even Kodak Picture CD. A fully-featured remote control and two pieces of AA batteries are included. This PA system also has one USB input to connect your MP3 players or other devices to play music, it supports both MP3 and WMA formats.Better yet, this system also comes with a built-in Dual UHF wireless microphone receiver and two handheld microphones with separate volume controls and indicators. The transmission range of the microphones can be as far as 300 feet. If more microphones are needed, there are three additional microphone input jacks (standard 1/4") that can be hooked up with either wired or wireless microphones. The speaker system is composed of one 50 watts amplifier, one 8" woofer and one 1" tweeters for clear, powerful sound. Rugged corner-mounted casters and extendible luggage handle are included. It also has a built-in tripod mount.