Aqualarm 20245, 12v Exhaust Overheat Alarm. Sends a signal to the warning panel, lighting the red light and sounding the audible alarm buzzer if wet exhaust temperature exceeds 200 degree F. Adjustable aluminum band fits 2" to 8" pipe or hose and easily installed with locking buckle. Includes five feet of marine grade Tinned wire. Prevents costly engine damage due to overheating.