There is a scientific plano-convex lens in the emitter that makes light go straight, as shown also in the pictures, so it emulates a lightsaber when light is reflected against a flat surface. It's really a cool replica, alternative to those expensive reveals. Has light, but no sound. It may be added though with the right parts and skills. Any questions please let me know.The item "Star Wars ANH Luke Skywalker custom reveal lightsaber Graflex 3 cell replica" is in sale since Tuesday, November 01, 2016. This item is in the category "Collectibles\Science Fiction & Horror\Star Wars\Products, Non-Film Specific\Other Star Wars Collectibles". The seller is "manooga83" and is located in Columbus, Ohio. This item can be shipped worldwide.