What is it in the photo?

The top one is a relay, probably for a motor or a larger load. Here is a link to one on McMasterCarr: McMaster-Carr

If you are comfortable with electricity :) you can grab a non conductive item, like a marker, and push on the black part where the two silver rivets are in the center of the relay. This will activate whatever it controls.. maybe a pump or lights?
 
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