{"product_id":"circuitron-800-5201-dt-1-bi-directional-grade-crossing-detector","title":"Circuitron 800-5201 DT-1 Bi-Directional Grade Crossing Detector","description":"Specifically deigned for use at grade crossings, using Opto-Sensors to detect the train. Output controls flasher, gates, bells, etc.\u003cbr\u003e\u003cbr\u003eDetects train when an Opto-Sensor is covered. Senses track polarity and activates only the Opto-Sensors for the direction of travel. Always turns off after the last piece of rolling stock clears the crossing. Includes four Opto-Sensors. Requires an Alternating Flasher Unit to operate flashing lamps. Note: DT-1 cannot detect a short train or loco if it falls between Opto-Sensors. Use in any scale with DC track power. 2 x 3\" printed circuit board. All Scales with DC Track Power\u003cbr\u003eBi-Directional\u003cbr\u003e10-18 volt DC input","brand":"Circuitron","offers":[{"title":"Default Title","offer_id":42130592727122,"sku":"CIR-800-5201","price":37.18,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0581\/3410\/2098\/files\/CIR-800-5201-2__12150__13359.jpg?v=1756164485","url":"https:\/\/modeltrainstuff.com\/products\/circuitron-800-5201-dt-1-bi-directional-grade-crossing-detector","provider":"Model Train Stuff","version":"1.0","type":"link"}