Dwarvin DVIRRXK101 HO Scale Railroad Crossing Kit Lamplighter DFL with Power Supply Battery & Charger Motocross Style Tread for Longevity

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Dwarvin DVIRRXK101 HO Scale Railroad Crossing Kit Lamplighter DFL with Power Supply Battery & Charger Motocross Style Tread for LongevityDwarvin DVIRRXK101 HO Scale Railroad Crossing Kit Lamplighter DFL with Power Supply This product system provides all that you need to integrate 2 Railroad Crossings together with 2 side on Detectors and 1 crossing bell all controlled by the Lamplighter DFL unit. The Detectors are of the pulsed infrared kind so they are insensitive to the ambient lighting. They stay on as long as they "see" an object. The DFL unit in turn turns off 5 seconds after all