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Sales / Service: (800) 452-3773. 1  Complete Business Security CSS is New Jerseyâs complete solution for integrated commercial security systems. 2  Complete Home Security Go beyond basic burglar alarm systems to total home control, convenience and peace of mind. Learn MoreSwitch Today & Save. The CSS Difference CSS is one of New Jerseyâs oldest and most respected alarm companies, specializing in security systems backed by the leading manufacturers in the industry.