There are four Waterbug Models that Winland offers: WB-100 (stands alone with audible output only), WB-200 (hardwire version), WB-350 (for connection to a wireless transmitter), and WB-800. All of these models will notify you of leaks before they become big floods. The WB-100 monitors a single location for water and is powered by a 9 volt battery with a low battery warning. The WB-200 can be used in conjunction with an alarm panel, bell, etc. The WB-350 must be used with a wireless transmitter.