The WIR TX90 combines modulator and emitter technology into a single operating unit. It is ideal for cinemas, auditoriums, courtrooms, schools and other large room facilities that require hearing assistance and simultaneous interpretation. The WIR TX90 can transmit an audio signal up to 28,000 ft2 (2,600 m2) throughout a listening area when used with Williams Sound's WIR RX12-4 receiver. Additional emitters can be connected to the unit for unlimited coverage. 2.3-3.8 MHz operation makes it less susceptible to high efficiency lighting interference. Meets ADA requirements for public hearing assistance; Dimensions,Weight: 11.25" W x 6.25" H x 2.125" D (28.6 cm x 15.9 cm x 5.4 cm), 1.8 lbs (0.8 kg); Carrier Frequency: Channel A: Selectable, 2.3/2.8 MHz, Channel B: Selectable, 3.3/3.8 MHz; Frequency Response: 80 to 15,000 Hz, electrical response.