XTRA Smart precision soil monitoring system The Toro Precision Soil Sensor continuously measures moisture levels in the soil and determines when to allow the irrigation controller to water, maximizing the efficiency of your irrigation system. There are two: wireless components to the system — a receiver that hooks up to the irrigation controller, and a sensor that installs in the ground. Any time the moisture level exceeds the user-defined optimum level for the plant material, the controller is prevented from running any irrigation programs. Highlights Turns most timers into a "smart" timer and meets the municipal requirements in many areas. Save up to 35% in annual water usage. Works with most irrigation timers including Rain Bird, Hunter or Orbit Wireless — up to 500-foot line-of-sight range. Easy to install — no digging or tools needed--does not require removal for mowing. The Toro Company Features & Specifications Save Water — Save Money: Check your local water agency for available rebates.Wireless Communication: Up to 500-foot (152m) line-of-sight.Signal Strength Indicating LED: A multi-color LED on the sensor probe indicates radio signal strength to assist in finding a suitable installation location.Automatic Calibration: The sensor will automatically detect the soil type and adjust all calculations accordingly.Slim Design: The sensor probe"s ultra-slim 3/4-inch profile allows it to avoid being damaged by mowing equipment.Long Battery Life: Easily replaceable batteries last up to 2 years with alkaline batteries (longer with lithium).Power: Probe: 3 AA batteries; Receiver: 24 VAC from controllerOperating Temperature: Probe: 14 degrees F to 170 degrees F (-10 degrees C to 77 degrees C); 14 degrees F to 140 degrees F (-10 degrees C to 60 degrees C)Range: 500-foot (152m) line-of-sight