Auto Barrier warning lights with single yellow and alt red flashing lights 4mm Scale

This is the modern type of barrier warning lights in 4mm scale. An approaching train actuates the single yellow warning lights and audible warning siren. As the train gets closer the yellow lights arev switched off and replaced by alternate pairs of red flashing lights. After the train has cleared the crossing all the lights and siren are switched off. The unit is supplied with all wiring which is colour coded to correspond with the terminals on the operating unit for ease of completion. Includes Reed switches, one magnet, speaker and a pair of fully assembled and wired barrier warning lights. Supplied with full instructions for Bi Directional single track or double track working. Requires a 12v DC or 16V AC power supply.