&amp;lt;p&amp;gt;&amp;lt;span style=&amp;quot;font-size: x-small; color: #000000;&amp;quot;&amp;gt;Blue and amber LED indicator lights to show humidity sensor and full speed modes. EnergyStar certified with DC motor technology DC motor allows fan to operate in full speed mode or humidity control mode by cycling ON/OFF switch Noise level is a quiet 1.3 sones Best price/peformance bathroom fan on the market Detachable 4&amp;quot; diameter duct connector Lightweight design for easy installation and lower vibration Impeller includes 67 fins to reduce noise output Soft start control reduces current impulse and start-up noise Consumes only 19.1 watts Ceiling mount only Annual energy cost for 24/7 operation is approximately $18.29 Self adjusting motor to humidity levels Blue and amber LED indicator lights to show humidity sensor mode and full speed mode&amp;lt;/span&amp;gt;&amp;lt;/p&amp;gt;