Businesses or venues can broadcast on one of three channels of assistive listening audio. The LT-803-072 Stationary 3-Channel RF Transmitter is an excellent choice. Universal inputs allow for the use of nearly any audio source including mixers, microphones, MP3 players, and more, and our signature Look & Listen (TM) LCD display provides immediate information about channel, lock, and RF power. The LT-803-072 also includes a power supply making it easy to set up and start using right away. Antenna not included.