Well the timer is just a DC delay on off thing and the large red and blue wires suggest a DC voltage that is being supplied because it feeds the timer directly, what looks like a grey input wire (sensor or switch) and a black output wire which looks like coaxial.
The box looks like it gets warm but not as warm as that thick DC cable would suggest, and the sticky pads would fall off too if it did.
The box is large enough for a circuit, but not something you would put an SCR in or anything like that.
Really it could be anything, need to know what is on the end of that black wire first.