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In radio communications, "voice activation" or "VOX" has been used for
decades where convenience or the need for hands-free operation rule
out push to talk. The idea is simple: monitor the microphone input
and transmit only when the user is actually talking.
Based on a quick web search the Motorola SX700 appears to be a Family Radio Service unit for use in the USA and the Motorola T5522 appears to be PMR446 radio for use in the UK. While the radios are similiar, they don't operate on the same frequencies so they won't be able to communicate with eachother. Because both FRS and PMR446 are very similiar, Motorola often markets versions of the same radio (with slightly different model numbers) for each service.