This is an APC UPS, targeted at PC use, as it provides 3 battery backups and a 4th surge protected 240v output. Obviously, a PC or sensitive equipment goes from the surge protected, and other items such as monitors and printers use the other sockets.
I suppose that any other equipment could also be used with it.
You can see that it is in the original box, measures about 350 by 700 by 200mm or less when it's out of the box - there's a whole posse of 240v cables in there for connecting stuff.
The photos show the box with all the details, but as tiyu can see, it had a new battery in 2015, and lead acid should stay good for years - like a car battery.
No need for it now the PC it was bought for has been replaced, and the replacement is only running non-critical functions.
Hasn't been powered up (or should that be powered down) for about 4 years now, so I can't guarantee it, but the worst would be another new battery, and screw fix or on-line should have one.