By monitoring soil moisture levels, the wireless Moisture Sensor reduces water use and protects your plants from overwatering. If the soil is too wet, the moisture sensor will send a sigl to the Eden Bluetooth Water Timer to delay watering. The exact moisture levels can be adjusted based on your area and soil and can be viewed within the App using your smart device. Using wireless technology, this sensor can be placed anywhere within a 328-foot 100 meter area with a clear line of sight.