The Series WD Water Detectors and Sensor Tapes is designed for dependable detection of water presence even of low conductive liquids. The water sensing tape attaches to module and if any liquid comes in contact with the tape the resistance is changed and the alarm will be triggered. The sensing tape is 1" wide and can be bought in lengths of 5, 10, 15 and 25' and is powered by 24 VAC or 24 to 30 VDC.