This infrared listening system ensures direct, clear delivery of your message without sacrificing security. The TX90 two-channel IR transmitter combines modulator and emitter technology into a single operating unit, which reduces operating cost, eliminates the need for rack space and eases set-up. Resistant to high-efficiency lighting interference. Up to 28,000 sq ft (2,600 sq m) coverage in single-channel operation with the WIR RX22-4N receiver. (Coverage area can be easily increased by connecting additional TX9 emitters.) This system features our stylish, NEW WIR RX15-2 headset-style, infrared receivers. Wall/ceiling omnidirectional mount is included. Stand kit is available for portable operation.