The Honeywell 470PB is a water probe that connects to compatible device such as the 5821 or 470-12. Add the 470PB to the 5821 transmitter and make a flood detector for Honeywell 5800-series security systems. By using the 5821-470PB together, flood detection is achieved for a wide range of applications; including bathrooms, laundry rooms and basements. The 470PB water sensor trips when in contact with 1/4" water (or any conductive nonflammable liquid) on each pin of the probe for 3 minutes. The 5821 transmitter will then restore when no water is on 470PB probe for 3 minutes.