Basement Watchdog BSD-HWA.My apologies, I must have misunderstood what your trying to say. When you mentioned "alarm unit" the only thing that came to mind was the smart water leak detectors which are made by Moen.
Use the Basement Watchdog Battery-Operated Water Alarm to detect leaks before costly water damage occurs. This alarm can detect as little as 1/32 in. of water and produces a loud 110 dB alarm that can