Based on the Audible Alarm section, which one are you getting? Low Battery (Sounding every 1second) or Overload (Sounding every 0.5 second)?
That is not my UPS. Its from some brand called "perfect", and I am sure it's chinese coz a bunch of chinese references came up on google when I searched it.
The sound I get is like 3-4 times continuos beeps (`0.5 s gap), and then again get it after 5-10 mins.
Anyway, I have decided to pull out the buzzer from it. I plan on getting a new UPS with my new system in a month or two. So wont bother about it much now.