MarineGuard Security Systems offer the best in invisible security detection. Only MarineGuard's unique Deck Sensors can be mounted under a boat's decking and detect intruders. The MG4 series boat alarm is exclusively designed to stop intruders before they can breach vital areas and cause damage. Peace of mind comes with knowing your vessel is secure. With MarineGuard Network, you're assured that you have the most reliable, convenient, and false-alarm free security system available.