DKey card switch for the power supply inside the hotel room - slot light with built-in lamp - 30 second switch-off delay - power supply 230 Va.c. The completion of the light point requires two “half-module blanking modules” (item K4949) at the sides of the badge holder.1.Used as a main switch in a hotel room, which can be activated by inserting a card.2.3.4.5.