Mains power outlet.
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You would need to check with the manufacturer of the UPS. Most likely this is to connect to the computer that the UPS is supporting. As the UPS will only be able to power the computer for a small amount of time there is normally a connection between the computer and UPS. This is for the UPS to tell the computer it is now running on the batteries and to tell the computer to shut-down in a controlled way.
A modem or router
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Generally speaking, devices that connect to a computer are peripherals.
A router