Due to manufacturer's restrictions this item cannot be shipped outside of the United States.The Sennheiser ADA 4000 Dual is a 2.3/2.8 MHz two channel stereo infrared system package for ADA compliance. The SI 1015 modulator accepts line level input via an XLR connection and drives the SZI 1015 (medium area) and SZI 1029 emitter panels. By generating higher than usual sub-carrier frequencies. The SZI 1015 is a 2-Watt radiator with a coverage area of up to 400 mÃ½. The radiator is switched on and off automatically by the modulator's RF carrier. The SI 30 is a small- to medium-area master transmitter that can be switched from 2.3 MHz to 2.8 MHz or used simultaneously for two channel/stereo operation.