Z-Stuff smart/signals for HO, O and G scale. Choose from custom order Signal Bridges, 2 to 8 tracks wide with signals on one side or both directions. Or select one of the Trackside Signals.
Exclusive optical sensors in the base of each signal detects trains. Just position your signal and plug them in. Use a 9V battery for outdoors or connect to your power pack. 9-18V AC or DC power.
When the train passes by or under the signal. LED changes to Red until the train has past. Then yellow for 3-10 seconds, then green.
see full line of smart Signals. Click here: http://www.z-stuff.net/