Circuitron
FL-2 Alternating Flasher

Walthers Part # 800-5102, p. 289 Walthers 2012 HO Scale Reference
A scale, $19.95, not currently in stock at Walthers, Expected: Unknown
This product is on-sale today for $16.98

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Flashes LEDs or lamps. Connects to Detection Units. Maintains constant flash rate. 1.5 x 3" printed circuit board. Requires 10-18V AC or DC input. 250 ma. output.