For ceiling presence detectors. For Busch-Wächter® Presence tech (6813-101). For Busch-Wächter® Presence tech DualLINE 6813/11-xxx. For Busch-Wächter® Presence tech BasicLINE 6814 U. For Busch-Wächter® Presence tech BasicLINE Corridor 6818 U. For all Busch-Smoke Alarm® ProfessionalLINE. For all Busch-Heat Alarm ProfessionalLINE. For Busch-Smoke Alarm® 6831-84 and 6832-84. Can also be used in conjunction with surface-mounted housing 6885-xxx and 6888. For Busch-Presence detector Mini KNX 6131/20-xxx and 6131/21-xxx. For Busch-Presence detector KNX 6131/30-xxx and 6131/31-xxx. For Busch-Watchdog® Sky KNX 6131/40-24. For Busch-Presence detectors Corridor KNX 6131/50-xxx and 6131/51-xxx.