Price is for 1 complete Cantilever bridge signalsfor double tracks ( right side use )prewired LED for 3 aspects( Green on top / yellow in middle / Red at bottom ) Characteristic Price is for 1 units Size for each : Check from the photo Operating Voltage: prewired resistor for 12V to 16V use Operating Current = each LED 20mA Metal Made and Brand new PRODUCT DESCRIPTION Control them automatically by moving train ( click the above photos to buy ) Control them manually ( click here )...