Product DescriptionThe F220-B6 Detector Bases work with the F220Photoelectric Smoke and Heat Detectors. The F220-B6is a 12 V or 24 V base for two-wire loops. The otherbases in this family are 12 V or 24 V bases for four-wireloops.Main FeaturesEasy installationInterchangeable detector headsUL listed when used with a detector from the F220familyGeneral InformationName: Bosch F220-B6 Detector Base, 2-Wire, 12/24V, The Bosch Group, BoschCategory: Bosch, Fire, Fire Detection Devices, Detector Parts & AccessoriesUPC Code: 782695107768Country of Origin: China. Country of origin is subject to change.