Know your garden better than ever by adding in a Smart Moisture Sensor. Connect directly to your WX1 or WX2 Tap Timer and Wi-Fi Hub for the ultimate smart watering package. Keep track of soil moisture and temperature via Holman Home and your smartphone, from anywhere on the globe. Automatically reduce your water usage based on the 5 different levels of adjustable moisture sensitivity. Record soil moisture and soil temperature data. Reduce water usage with 5x levels of adjustable moisture sensitivity. Smart Moisture Sensor works as an add on only. Requires WX1 or WX2 Tap Timer and Wi-Fi Hub for use. Use Smart Moisture Sensors with WX1 and WX2 Tap Timers. 2 Year Warranty.