Avoid unnecessary wastage of water by turning off sprinklers when raining. The system will shut down when the internal flow reaches a total level of 2 oz. Programming will resume when the water evaporates. To connect, simply remove the front panel of the Duplo water timer by pressing the 2 side buttons and slide the connector onto the far left prongs. Supplied with a stainless steel wall bracket, install the sensor in a clear area up to a distance of 6 from water timer without any type of vegetation coverage and away from sprinklers. It is important to keep the orange over in place to keep out leaves and/or impurities that could impair operation. The unit is designed to operate with the #3107 Duplo 2-line water timer only and is sold separately.