Toro 53770 Sprinkler System Timer Wireless Rain Sensor
The Toro Wireless RainSensor is a water conservation device that meets legislative standards in states and municipalities with mandates.  The RainSensor works by absorbing rainwater and then responds by interrupting power to the valves. The Wireless RainSensor will then gradually dry out, as does the soil, allowing sprinklers to run as scheduled. The rain sensitivity can be adjusted from .125  to 1 inch.  The Wireless RainSensor is easy to install using the "Quick Clip" gutter bracket tool free.  Because it is wireless, there is not wire required to communicate between the sensor and the controller.  The sensor has a 300 feet (line of sight) range.  The weatherproof receiver can be mounted indoors or outdoors. The Wireless RainSensor is compatible with any sprinkler timer and does not interfere nor change the timer's programming.  Operating temperature -20  to 140 degrees F.  Transmitter battery level indicator.  5-year replaceable battery (battery included; standard CR2032.)  UL and FCC Approved.