The WIR TX900 infrared system is designed to be the best-sounding and most cost-effective solution for simultaneous interpretation of up to four languages. This wireless lightwave system helps listeners hear the language they understand, while minimizing background noise, and overcoming poor acoustic conditions commonly found in conferences. The flexible design of the WIR TX900 system permits permanent and portable installations and can accommodate a wide range of auditorium sizes and configurations. 2.3-3.8 MHz carrier frequency (Baseband) minimize interference from high-efficiency lighting and no license is needed for transmission - anywhere in the world! Wideband transmission means superb audio quality for hours of listening without fatigue. Listen to the program with the optional RX22-4 four-channel receiver, RX14-2 two-channel receiver, or RX16 two-channel/stereo receiver.