Tempest does not require frequency coordination, ever! Frequency coordination for older RF technology is expensive, complex and time consuming. In stark contrast, regulations governing the use of the 2.4GHz band throughout the world require that devices operating within this band utilize technologies that minimize interference and promote cooperative use of the available spectrum. Tempest incorporates advanced technology like patented Frequency Hopping Spread Spectrum and proprietary Redundant Data Transmission to maintain a robust, reliable RF link even in the presence of many other wireless devices utilizing the same frequency band. Just turn it on and it works… virtually everywhere!
http://www.clearcom.com/product/wireless/tempest2400-digital-wireless-system