The WDC-900 digital and wireless conference/discussion system is designed to the most flexible discussion system available. Operating in UHF band and Zigbee wireless communication technology ,the digital and wireless discussion units produce high quality CD sound due to a very high fidelity circuit design. The system is protected against interference from other wireless equipments such as computers, mobile phones and blue-tooth devices. Set up easily and quickly with no impact on location, especially for historical locations, the benefits can be even more pronounced. One no longer has to worry about the damaging antique materials of a grand hall. No cables have to be laid or holes drilled, the Relacart WDC wireless discussion systems offer a professional and perfect solution for challenging locations.