Sea-Dog Ignition Safety Kill SwitchIgnition 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 ignition (gray cap) version functions in applications where the circuit is normally closed (complete) with lanyard clip in place on switch. When lanyard is pulled and clip is removed from switch, circuit is open (not complete), resulting in interruption of