Group 4 Technology's Symmetry M2150 range of fully flexible intelligent controllers and readers for building security systems are designed for commercial buildings, from small offices to large multi-national organizations, and government facilities. A single controller can be combined in more than 50 configurations to provide access control for up to 16 doors in one location and up to 72 inputs or 72 outputs for monitoring and controlling security devices. The system can be expanded to more than 5,000 readers. The system has three different networking options, including the highest levels of encryption available, a wireless alternative and a traditional panel-to-panel connection.