2VOICE, two wires in the entire system for quick and easy installation. Maximum flexibility: from single-family homes to larger building complexes.Product features:Video distributorConnections for bus-IN, bus-out and for up to 4 VM/HAT for every 4 monitors a video distributor is required Surface mounting or installation in flush-mounted round boxTechnical data:Compatible with system 2VOICEDimensions: 45 x 45 x 16mmInstallation note:Note: