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Reviews around pitch whine (1.69 of 5)
APC UPS, 425VA UPS Battery Backup Surge Protector, BE425M Backup Battery Power Supply, Back-UPS Series
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However it produces constant high pitch whine all the time
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One of the two units I purchased emits a high pitched whine when the power is off
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My pet peeve with electronics is that often power circuitry will have a high pitched whine that is clearly audible in quiet environments and extremely annoying
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n’t last like apc does
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