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You can receive weather radio broadcasts on receivers that are designed to tune into these weather radio frequencies. Listening to the weather information all the time, or switching to "alert only mode" are the two options on a typical weather alert radio. On the weather alert mode the radio will quietly listen to the broadcast for emergency information. When the radio detects there is an emergency broadcast, it un-mutes the speaker so you can hear it.What actually wakes up the radio when on "alert mode" is a technology called S.A.M.E. or Specific Alert Message Encoding. A basic weather radio can be set to turn on for all hazards, which is fine if you want to be alerted for everything. Using the S.A.M.E. technology you can control what type of alert will be heard. S.A.M.E. technology takes weather alert radio to a new level.Prior to S.A.M.E. technology, and now used in conjunction with it is a simple audio tone at 1050Hz which is what will awaken a basic weather alert radio. The advanced newer weather alert radios using S.A.M.E. will be aware of the tone, but will not awaken unless the type of alert matches your listening preference.