Due to manufacturer's restrictions this item cannot be shipped outside of the United States.The Sennheiser ADA 3000 Single is a 2.3 MHz single channel infrared package for ADA compliance. 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. The SI 20 is a small- to medium-area transmitter or modulator and covers up to 750 square feet. Coverage can be increased with additional SZI 30 slave emitters. The HDI 830 is a professional two-channel stethoset receiver for wideband transmission systems (with carrier frequencies of 2.3 MHz and 2.8 MHz) in museums, theaters and churches.