On further testing, the unit is now not powering anything up, and is making a faint warning noise that is very soft compared with the typical battery back-up noise these things usually make.

After less than a year and not much use, mine now makes a constant loud unbearable noise that is not the alarm and that I cannot turn off.

Terrible high pitched noise after 3 months.

One of the plug banks does not have power and the unit makes a loud buzzing noise

My setup connected to this battery which is connected to the wall directly and nothing pluddged in the second slop.-A desktop (include keywork and mouse)-MonitorIt started a strange noise, not the beeping sound... it is like a click sound, like it is switching between the battery and power

A great ups i use it for my saltwater tank incase of an emergency atleast ill know for about 30 mins after the power is out somethings will keep working