Stanley Convergent Security Solutions, also known as Stanley CSS, is one of the largest systems integrators in the United States that designs, installs and maintains systems for fire, video surveillance, access control and monitoring applications. It serves industrial, government, commercial, residential and national customers. The company provides services for more than 235,000 clients. Stanley Convergent Security Solutions offers carbon monoxide monitoring, access control and automatic fire alarm monitoring systems. It also provides the HSM National Account Program. The company has over 60 offices in nearly 110 metropolitan markets. Stanley Convergent Security Solutions is a part of Stanley Works.