Model: The signal has an integrated electronic signal circuit and 1 separate signal decoder. Control of all functions is possible in the digital system with the signal decoder included with the signal, or with a conventional control box. The signal decoder can be installed under C Track or under the layout. For digital operation, the configuration and the address can be assigned and tested before the installation. Connections for controlling train movements are on the signal decoder. Height without base 50.0 mm / 1-15/16".