Magneto Safety Kill Switch Marine emergency cut-off Kill Switch attaches to your life vest while operating a boat or personal watercraft. Designed to instantly cut battery power when detached. The magneto (red cap) version functions in applications where the circuit is normally open (not complete) with lanyard clip in place on switch. When lanyard is pulled and clip is removed from switch, circuit is closed (complete), allowing grounding to a suitable ground such as a grounding block, the battery, or a suitable area on the engine itself. The kill switch includes a coiled lanyard that is approximately 15\