Emergency set System 55 pure white glossy Features: Call module with red LED signal light, integrated zero-voltage contact, optionally activated buzzer (continuous tone) and the option of setting either flashing light or continuous light. Pull-cord button with 2.5 m pull cord with red handle and reassurance light in button housing, suitable for wall or ceiling mounting. Switch-off button with integrated green button. Flush-mounted power supply unit 250 mA. As an option, the call set can be expanded with a duty room unit with an integrated sound generator for acoustic call signalling, a green presence button with presence light, and a yellow buzzer switch-off button. Notes : Use uninterruptible power supply for installation pursuant to DIN VDE 0834. Individual components can be purchased later to extend the emergency sets.