TEKTRUM TMIC MINI DIGITAL PLL PERSONAL RADIO STATION Broadcast music to every FM radio in your house -guaranteed to cover your entire home Cover up to more than 200 feet range in open field - the most powerful mini PLL transmitter in the market Ultra-light for portability. Easy-operating channel selection pushbutton &amp; clear LED channel indicators. 3 way powered by 9v battery or car cigarette adapter or AC/DC wall adapter. Built-in microphone and connector for external head-worn microphone Great for business, personal radio station, fitness and recreational center, church, drive-in theater, sports, school, conference, party, picnic...