Negative Positive
Title: Poor quality control - defective unit out of the box
Review: Out of the box, this battery backup was making a loud buzzing sound constantly, all the time, even after over 36 hours plugged in. Initially I thought it was the sound it makes while charging but it turns out it was defective. It seems like APC has quality control issues, big time.I am returning my unit to Amazon for a refund. I contacted APC and they wanted to replace it for me however I prefer to buy another product instead since I do not trust APC's workmanship.
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