Circuit

''"Circuits are tiny, tiny wires, glued on pieces of silicon. Their purpose is to take inputs from other wires and, more often than not, put something else on output wires. Why the input wires didn't have the correct values to begin with, is a question only engineers understand." - The description found in eng.translation''

A Circuit is a pickup you can find in Cobalt's Classic Survival, Waves Survival, and Story Modes. In Classic Survival, it could be converted to volts, but in Waves Survival and Story Mode, it is converted to volts upon being picked up.