Moving Prop (MP Alert) Alert Light system is a highly visible light system that provides additional notice to swimmers when the engine is running and the propeller is in motion. This kit is a two light kit that includes the smart lights with 6 LED lights each , a control module (connected to the engine computer) and a 20 ft wiring harness (other lengths available). Also included is hardware needed to mount the light. Additional lights can be purchased to add to the system. (Oval Shape) Works with all SmartCraft compatible engines.