The WBB is a weatherproof back box for use with SSM/SSV bells.
This accessory is UL listed for use with: H12/24K, S1224MCK, P1224MCK, and P12015K series SpectrAlert® wall horn, strobe and horn/strobe models: SSM24 and SSV120 series alarm bells
WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov