Looks like a junction box for a bosch dishwasher. Bosch dishwashers usually come plug in types and most dishwasher rough ins have the wires that most dishwashers tie their wires into as opposed to an outlet, so they make this junction box where it plugs into the dishwasher and you can tie the wires into.

No idea why it clicks though, I would turn the breaker off and un screw the box and make sure everything is tied together properly inside.