Price is for 2 complete4 heads Common Anode Railroad Crossing Signals with 2 tracks sign( come with 1 circuit board flasher )HO Scale with screw base for easy installation default common anode may inform me via the Paypal's note if you need common cathode signalCharacteristic Price is for 2 complete signal + 1 circuit board flasher Size for each : please check from the photos for HO layouts Brand new PRODUCT DESCRIPTION you may control them manuallyor Cont...