Programmable sprinkler controllers are convenient, because you don't need to be at home in order to water different areas of your lawn properly. But if it rains unexpectedly, you run the risk of overwatering and damaging your property. The Rain8net 8-Zone Irrigation Controller is a modular 8-zone sprinkler controller module that can be controlled over the Internet by any computer. This expandable irrigation system allows non-X10 control of 8 zones directly from your PC, which must remain running to control the irrigation schedule. Schedule watering using automation software, such as HomeSeer (sold separately). Environmental data is automatically downloaded from the web to allow a more informed irrigation schedule. Normal watering periods can be altered based upon current conditions such as wind speed, day of the week, forecasted rainfall, and several other criteria to assure that water is dispersed only when needed. Access your system remotely to control any or all zones and to verify status. Additional modules (sold separately) may be daisy-chained to provide control and 24 VAC power to as many as 2040 irrigation zones from a single COM or USB port. This irrigation controller provides non-X10 control of your sprinkler system from your PC. If you have an X10 system and want to include irrigation in your home automation system, use the Rain8 2-way X10 Sprinkler Controller instead.