Guardian Catalytic Converter Alarms were designed to attach to the undercarriage of your vehicle to deter thieves from stealing your catalytic converter. Mounted safely away from the heat of your exhaust, the alarm monitors vibrations on your exhaust pipe and when alerted produces an ear piercing 113 decibel alarm.

Waterproof, shockproof, and shielded from heat, Guardian Catalytic Converter Alarms can take a beating from the everyday conditions you find beneath vehicles. Every unit comes with directions on how and where to best install your alarm, as well as a 'Guardian Undercarriage Alarm' sticker to let thieves know it's not worth messing with your vehicle.