Low frequency or low freq or LF refers to radio frequencies (RF) in the range of 30 kHz–300 kHz. In Europe, and parts of Northern Africa and of Asia, part of the LF spectrum is used for AM broadcasting as the longwave band.
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EZ-Air Plus
EZ-AIR PLUS allows you to place a thin bargraph or linegraph anywhere on your screen to help you pace your inhalation and exhalation.