The Simple to Set 12 Zone Smart Controller saves you time, money, and water with the Self-Adjusting Weather Sensing Technology that is so simple to use, you can forget the instructions. The Smart Controller automatically adjusts your watering schedule to take into account both seasons and current weather conditions. This allows the controller to optimally water plants year round without the need to constantly reprogram the controller throughout the year. The SST accomplishes this with a combination of a built in nationwide historical weather database and a Smart Weather Sensor that is included with the product. For indoor and outdoor use.