I've seen occasional unexplained power loss to my desktop, intermittent buzzing or clicking from the APC unit, and several false alarms where the unit believes it has no power even though it does

We already had a 3 hour power loss community-wide

Protects my PC against sudden power loss crashes and maintains power to my cell phone booster.

I experience the "chirp" that the other folks that left reviews are also experiencing (included video)I purchased 2 units 1500VA and one 1000VA both experience the wonderful chirp that is a little annoying when they are together.very dissatisfied with both of these products as i've owned other APC units that run completely silent until under commercial power loss.*added to

You can even turn the screen to stay on, and the power loss sound off

Also, if power is lost, the software that was included will shut the computer down before the unit runs out of juice, ensuring that my machine doesn't try to keep going after a power loss

I know I don't have to worry about power loss.

Great backup for power loss

That means the expected standby time during a complete power loss is around one hour, even while using the computer.