being used in the Super Bowl. Audio frequency response of current products is limited to less than 4 kHz; this means that natural vocal sibilances above 4 kHz are absent. Ess sounds like eff, requiring additional spoken clarification such as saying "'S' as in 'Sam'".

U.S. & Canada Wireless Frequencies

The United States and Canada have several frequency ranges for wireless intercom systems and other wireless products. They are 49 MHz, FM band (160-270 kHz),

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