The electronic timer receives an impulse whenever the infra-red beam is interrupted. This sets the timer in motion for the period designated (2 to 24 seconds). Then it shuts off. Should a train remain in a position to break the beam, the time extends accordingly.
in: 14-16 volts AC or DC, out: 14 volts, max. 150 mA DC, time setting: 2 to 24 seconds.