I have a few UPS units and a power inverter around my home that all use piezo buzzers as alarms. These are designed to get your attention to let you know the UPS is running on backup power or that the battery driving an inverter is low. Often these are used in office or noisy server environments so the buzzer needs to be loud enough to cut through the noise to let you know this is a problem.
I've found this to be too loud, especially with some of these in my bedroom. I can usually tell when the power is out so I don't need the UPS to tell me. Some newer UPS units have a way to disable or change the volume on the alarm, however most cheaper units do not. Many people fix this by cracking open their devices and either desoldering or cutting off the buzzer.
A far easier fix is to put a small piece of packing or scotch tape over the buzzer. This does not completely silence the alarm, but makes it significantly quieter, and can easily be reversed. The tape minimizes how much air the buzzer can vibrate, dampening the sound.
If you're not comfortable opening up your electronics, find a teacher to assist you. "No user serviceable parts inside" is manufacturer speak for "be careful when doing something stupid"
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