Price is for 1 complete2 heads Common Anode Railroad Crossing Signal( without circuit board falshers )O Scale with screw base for easy installation they can be lightedCharacteristic Price is for 1 complete signal Size for each : please check from the photos for HO layouts Brand new PRODUCT DESCRIPTION you may click the following photo to buy the flasher circuit board:you may control them manuallyor Control them automatically by moving train ( click the above photos )...