The Invincible Marine BR51303 Kill Switch with Lanyard is used on all standard inboard/ outboard engines, and satisfies existing laws for mandatory emergency stop switches. This product is especially designed to stop your engine when the lanyard is pulled. If you lose or break your kill switch key, you won’t be able to start your engine, and most marinas don’t stock replacement keys! The kill switch is equipped with a swivel snap hook to prevent tangles, and rust-free crimps. Don’t leave the dock without this nifty product! Whether you"re outfitting your boat for the first time, or replacing well-worn nautical parts, this product is an essential accessory for your boating and domestic needs, and is perfect for nautical journeys and mechanical maintenance. Precision and reliability are the marks of quality that this product has proven time and time again, guaranteeing steadfast performance with each use. The Invincible Marine BR51303 Kill Switch with Lanyard comes with a 1-year limited warranty and protects against manufacturing and workmanship defects. Rugged, tough and reliable, Invincible Marine is well-known for their hardworking nautical line. For freshwater and saltwater boating, Invincible Marine designs products for avid fishermen and weekend boaters. Quality, utility and innovation go into every Invincible Marine product giving you more time on the water.