Honeywell B501-IV Standard European flangeless mounting base. UL/ULC listed, Ivory, 4"
https://www.sawab.app/shop/b501-iv-honeywell-b501-iv-standard-european-flangeless-mounting-base-ul-ulc-listed-ivory-4-2418
https://www.sawab.app/web/image/product.template/2418/image_1920?unique=9a03526
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Operating voltage: 15 to 32 VDCStandby current: 150 µA maximum