DZ-1052V Hooded 3-Color Trackside Signal | O-gauge

Exclusive optical sensors in the base of each signal detect an adjacent train.
Just set them down and connect 2 wires to power for a working signal.
When the train passes the signal, the indication will change to RED or stop and hold until the train has passed. 8 seconds after the train passes, the signal will change to YELLOW or caution.
After 8 more seconds, it will change back to GREEN or clear.
The signal only needs (9-18V AC or DC) power to operate, but it does have an input (YELLOW) and an output (WHITE) for additional possibilities.
All the new "V" version signals have variable delay (1-60 sec.) which can be set by the user.