Heiman HS2WL-M Matter Water Leak Detector with early leak and freeze detection, 75-dB alarm, blue LED, and IP67 protection rating The Heiman HS2WL-M is a compact Matter water leak detector designed for early detection of water leaks and freezing conditions. As soon as water is detected, the water leak sensor issues a local warning with an alarm tone of at least 75 dB at a distance of 1 m and a blue LED indicator. This allows for reliable monitoring of at-risk areas in the kitchen, bathroom, basement, utility room, or utility closet.