Only install in conjunction with commercially available flush-mounted device boxes in accordance with DIN 49073, Part 1, or Busch-Jaeger item no. 3040 flush-mounted box for masonry, 3050 flush-mounted box for hollow walls or 3060 flush-mounted box for concrete) With screw terminals. Not illuminated. Version: 2-pole, one-way and two-way switching Design: flush-mounted