Class 5 HO Signal tri-color LED.   It is the companion lighting kit for the Class 5 Searchlight Signal.  You need one lighting kit for every searchlight signal head you want to light.  The signal shown in the photos is not included in this lighting kit, the photo show the LED installed in a Class 5 signal (offered separately).  Complete detailed instructions for use are included.  You can use this LED lighting kit to light other brands of model signals, including N scale where this very small LED will fit into most any signal.  Shipping to United States addresses only, thanks for your understanding.  Thanks for your interest in another spdaylight product on Ebay!