An assembly of mains electricity (AC-powered) devices intended to be used in conjunction with an audiometer to reward an infant/child during instrumentation conditioned reflex audiometry/play audiometry. It includes hardware (e.g., monitor, lights) intended to give the child a visual reward, and dedicated operating software; it may include additional controls (e.g., foot-switch) and toys. It is intended to be operated by the healthcare professional to build the conditioned response during auditory testing.