Ring Alarm power supply

Can anyone confirm the power supply specs for the alarm base station (for US)? I assume it’s a transformer based setup since it has battery backup built in. From what I can find in online images, its a transformer style plug (big block at the wall end of the cord).

Can someone get me the volts/amps from their power supply? I am interested in this system for my RV but I don’t always have AC and would like to determine if I can build a direct DC power setup for it.

The brick is about 3" H x 1.5" W x 1.25" D. From the label:

Input: 100-240V~50/60Hz 0.5A
Output: +5.0V==2.5A, 12.5W

For size:

Thank you so much @windracer . Looks like a standard USB power supply will work just fine!

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