The East Coast Circuits Crossing Signal Circuit is designed specifically for crossing signals without gates. It works with any LED crossing signals designed with common-anode circuitry. This circuit is part of the line of East Coast Circuits HO Scale electronics and scenery products. Input 9-12V AC/DC Dimensions 2 x 2′ Draws approximately 36mA Handles up to 16 LEDs Built-In LED Indicators Dual track bi-directional operation Automatic light sensor adjustment Secondary trigger output Eight wired light sensors Included Built-in resistors for 3V operation Built-in pins for future add-ons For common anode LED based crossing signals (common positive) Sensors will not operate in the dark