The improved mechanics of the new-generation Gira KNX bus coupler buttons provide optimised switch feedback. The surface-mounted variants are water-protected in accordance with IP 44 and are delivered as complete devices. The water-protected surface-mounted bus couplers, 1-gang with single-point and two-point operation feature a configurable LED. The Gira KNX button bus couplers form the interface between the KNX system and the user. The extremely robust devices are ideal for use in properties with particular demands, e.g. workshops, public buildings, or even basements.