Price is for 1 completeGreen / Red + Green / Red searchlight SignalHO scale 1:87made of bi-color LEDs with resistors and ready for 12V or 16V DC use Default: common anode signals.you may inform me via the note when pay if you need common Cathode signal.Characteristic Price is for 1 units Size for each : please check from the photo for HO scale 1:87 the signal head is made from Plastic Brand new PRODUCT DESCRIPTION You may Control them automatically by moving train ( click the above photos ) Control them manually ( click here )...