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Noise! They are louder then you think.
Ability to mute the alarm.
Bonus points if you can connect it to a computer to automatically shut it down cleanly.
Optional, battery expansion out of the back
Keep in mind, UPS's should be in well ventilated areas, they can off gas hydrogen and other explosive fumes depending on the battery type
Didn't think about noise and that's important to me so thanks, is there anything special to look for the battery to make sure it can support my 3 devices at the same time? Like amp or other electric specifications?
A note on noise in case there is some misunderstanding.
The UPS is silent during normal operation (at least, all of them I've ever seen are, maybe super heavy duty ones will have a cooling fan but I've never seen one and even that can't be too loud), the only time it will make noise is when the power goes out and it switches to battery or if you are pulling too much power to keep the battery fully charged it will beep to warn you.
If you are expecting a few outages that last a few seconds, you probably don't need the beep warning, so as the other person said a mute option would be nice as the beep is usually very loud, my first UPS did not have this option so I just opened it and cut the lead to the speaker..
I will look for a fanless ups as I'm kinda sensitive to noise and everything is setup in my living room..., I will make sure I have the mute option available.
Another small note regarding fans, I've never actually seen a UPS with a fan before I just figured there's probably some out there, if you're looking at something and it doesn't say anything about being fanless or silent or anything I'd just assume it doesn't have a fan.