The Tempest900 system offers customers another viable and reliable wireless intercom option for their specific application needs. Tempest900 is only available in North America, while Tempest2400 is distributed worldwide. Tempest900 offers improved coverage in areas where more structural penetration is required and in large enclosed areas where multipath interference can be a factor. The longer wavelengths of the 900MHz frequency band allow Tempest900 signals to break through dense walls and other structural objects more readily, increasing the range for users and reduces any potential loss of audio. Tempest900* operates in 902-928 MHz (26MHz) of the spectrum often referred to as the 900MHz ISM band and allows a maximum of 5 BaseStations and 25 full duplex BeltStations operating license-free using FHSS (Frequency-Hopping Spread Spectrum) technology.