{"product_id":"sd-2-3-position-semaphore-driver","title":"SD-2 3-Position Semaphore Driver","description":"Use with the Tortoise Switch Machine and an upper or lower quadrant semaphore-style signal. Includes al the logic circuitry to drive the signal to all three positions. Works with BD-1 or BD-2 Block Occupancy Detectors. A minimum of two blocks must have detectors installed for the SD02 to indicate all three positions. Requires 10-18V DC power.","brand":"Circuitron","offers":[{"title":"Default Title","offer_id":53179152302445,"sku":"800-5520","price":34.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0929\/7228\/6317\/files\/800-5520_01_6895743c-bd1b-4898-b345-db36fcbf617c.gif?v=1774984173","url":"https:\/\/walthers.com\/products\/sd-2-3-position-semaphore-driver","provider":"Walthers","version":"1.0","type":"link"}