The detector indicates boat room water floods (e.g. cellars, bathrooms) or water (waste) high level indicator. This information is sent to an alarm system for alert message transmission. It is connectible to an Oasis alarm system or to UC and  AC wireless relays via a JA-81M wireless detector. The LD-81 takes its power supply from the JA-81M´s circuit.

It is possible to use the LD-81 with an older type of detector, the JA-60N, for Profi systems if you insert a 4k7 resistor in series.