The Neptune Systems Advanced Leak Detection Sensor – ALD-P1 is a leak detection sensor to be used in conjunction with the ALD module. The probe is low-profile so it slips easily under carpet; hiding it away, but giving you the peace of mind of leak detection. Easily plugs into the ALD with a modular RJ11 connection. The ALD-P1, together with the ALD Module, gives your Apex the ability to detect water on the floor in up to four separate locations and tells your Apex to sound an alarm, email you, or whatever action you desire giving you the ultimate in peace of mind.