The 1010-H2O is a Water Probe that connects to a smart control panel that can detect the presence of water when the water bridges across the two protruding probes. There is no polarity so the wires can be connected to either terminal. Multiple water sensor probes may be connected on the same two wires in parallel. The 1010-H2O is best mounted on the base board or wall just above the floor using two screws. Use with the Flair SZA200-H2O or other smart alarm panels.