HRC 100 RS RF - Hydro-Rain Wireless Rain/Freeze Sensor

Easy No Tools Required—Rain gutter mount bracket is equipped with a tool free bolt system that is both quick and intuitive to install.
Adjustable Moisture Activation—1/8", ¼", ½", ¾", 1" rainfall settings for variable climates.
Hygroscopic Discs—Absorb water to activate rain switch.
Reliable Freeze Sensor Option—Shuts off timer when temperature drops to 37°F, protecting vegetation from the effects of freezing water.
Universal—For use with most brands of 24 Volt sprinkler timers.
Quick Rain Gutter Mount—No tools required for mounting the sensor to a rain gutter.
Constant Communication—Every 30 seconds, (HRC 300/390 models), a signal between the transmitter and receiver for accurate timed water metering. All other timers transmit updated signal every 15 minutes.
Transmission Range—Over 300 feet (91.4 m) line of sight.
Manual Bypass Control—Allows for deactivation during sprinkler system maintenance.
Dry Vent—Allows air to be circulated or dampened for fast or slow dry, effectively reducing time for the next watering cycle.