The WIR SYS 7522 features the WIR TX75 infrared transmitter ensuring participants within a conference room, courtroom, classroom or even other mid-sized venue receive direct, crystal clear interaction of your message without sacrificing security. The system includes three WIR RX22-4 receivers which were designed for single-or two-channel applications. The sleek and even stylish TX75 is designed to maximize coverage area up to 5,000 square feet in single-channel function, up to 2 more slaves (sold separately) can easily be added for more coverage all the way to 5,000 square feet each for a total coverage are all the way up to 15,000 square feet. Placing more slaves within the same room increases coverage and enhances freedom of movement. A single CAT-5 cable carries both power and signal to slaves making it a truly one-cable connection. The mounting bracket and power supply are included making installation simple.