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This is very quiet. I haven't noticed any noise at all. The only time my UPS has a noise is when the battery gets old and needs to be replaced (you can normally buy a replacement battery on line or at Home Depot (not expensive at all).
Sorry, there was a problem. Please try again later.This unit is almost silent no noise no humming no buzzing.
Sorry, there was a problem. Please try again later.When operating on utility power, there should be no noticeable noise. When operating on battery, if the alarm is enabled, it will beep to tell you its on battery. You can mute the alarm if you do not wish to hear it. Also, there is a small fan that runs when its operating on battery, but you will not hear it unless you place your ear next to the unit.
Sorry, there was a problem. Please try again later.can not hear any noise from the unit.
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