Working Principle: WN35 leaf surface wetness sensor is designed to leaf blade and to detect whether there is water on it, which speculates the wetness of leaves or plants around the sensor. Please Note: WN35 sensor detect whether there are any water on the surface of nearby leaves or plants by simulating leaf blade, not inside nearby leaves or plants. Features: This sensor can be simulated as a leaf and detects the moisture level of the nearby leaf or plant. Long wireless range up to 300 feet(100 meters) in open areas. Transmits readings every 79.5 seconds. LCD screen display for current reading. Up to 8 channels supported when paired with a GW1000/GW1100 Wi-Fi Gateway or Weather Station Console (HP2551/HP3500/HP3501). Channel names can be on the app or console(for HP2551only). Setup Guide: Remove the battery door on the back of the transmitter by removing of the screw( make sure the rubber seal is intact when mount or dismount the battery door ) Insert .5V AA battery (be aware of polarity: flat side of the battery go to the spring side of the battery compartment). The moisture reading will display on the LCD screen immediately and normally update every 79.5 seconds (the sensor transmission update period). Note: If no reading on the screen, make sure the battery is inserted the correct way or a proper reset happens. Do not install the battery backwards. You can permanently damage the sensor. Close the battery door by installing the screw. High-Accuracy Measurement: The WN35 Leaf Surface Moisture on Foliage Sensor provides highly accurate measurements of leaf wetness, ensuring that you have precise data to work with. Easy to Use: With its LCD display and simple interface, the WN35 Leaf Surface Moisture on Foliage Sensor is easy to use and provides clear readings that you can understand. Up to 8-Channel rted: The WN35 Leaf Surface Moisture on Foliage Sensor supports up to 8 channels, allowing you to monitor multiple leaf surfaces at once. Frequency:Other areas: 433MHz Power:1x1.5V AA batteries(not included) Wireless transmitting range:100M(300feet) Sensor reporting interval:79.5seconds Sensing moisture 0~99% Accuracy: +/-10% Waterproof level:IP66 color: White material: plastic Package Contents: 1 x Leaf Wetness Sensor(433mhz) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.