The label indicates it's a 'Camera DC power supply'. It looks to have 4 outputs. It has a mains input, so it clearly steps down the voltage. Judging from the pic there's no big transformer, so it's probably a fairly conventional SMPS inside the perforated enclosure.
If the unit has any type/model numbers or maker's name, Google for info.
A quick Google for 'Camera DC power supply' showed most such supplies are rated at 12V, around 1A per outlet.
There are plenty of cheap 12V SMPS available (an old PC supply will do nicely). Probably cheaper (certainly easier) to buy one rather than make one.