Dew warning
A dew warning, also known as a dew alarm or dew signal, is an error indication on VCR's and camcorders if the VCR/camcorder develops dew inside the unit from being exposed to extreme temperature and/or humidity changes.
Usually, a "DEW" indicator or error code lights up on the display of most VCR's/camcorders, and on some, a buzzer may sound.