Surface-mounted housing, studio white matt, Busch installation bus KNX, presence detector, Busch-Watchdog AP, surface-mounted housing for Busch-presence detector KNX, Busch-Watchdog Sky KNX and Busch-presence detector Corridor KNX. For surface-mounted installation of a Busch-presence detector KNX 6131/30-xxx (-500), a Busch-presence detector Premium KNX 6131/31-xxx (-500), a Busch-presence detector Corridor KNX 6131/50-xxx (-500), a Busch-presence detector Corridor Premium KNX 6131/51-xxx (-500) or the Busch-Watchdog Sky KNX 6131/40-24 (-500). Protection class device: IP 20 Dimensions (H x W x D): 91 mm x 91 mm x 33 mm