rice is for 2 XRailroad Crossing Signals( Come with 1 circuit board falshers )Suitabel for OO or HO Scale Layouts3V Red 3mm LEDs made Common Anodethey can be lighted manually and flash alternatively automatically CharacteristicPrice is for 2 signals + 1 circuit boardsSize for each : Approx. 70mm or 2.76" inch Heightfor OO or HO Scale LayoutsInput Voltage for the flasher board: DC 3V to 6V.Brand newPRODUCT DESCRIPTION you may control them manuallyor Control them automatically by moving train ( click the above photos )...