The Skinner box was a device designed by B. F. Skinner, which he used in reinforcement experiments on rats. The apparatus contained a food-releasing mechanism, which could deliver food as a reward for specific behaviours. The device also contained a grid, to which an electric current could be applied as an aversive stimulus. The Skinner box allowed the experimenter to control reinforcement contingencies, and to record behavioural responses.

Source:

Nevid, J. S. (2009) Psychology: Concepts and Applications. (pp. 187-188). Houghton Mifflin Company.