Description: HIGH QUALITY: The science experiment is made of high quality wood material, durable. FEATURE: Lightweight, DIY kits, easy to install, exercise scientific cognition and interest during exploring. FUNCTION: The two copper strips on the soil humidity transducer module are the Transducer probes. Insert them into the soil and it can detect the moisture of the soil. Soils are more conductive when wet, reflecting lower electrical resistance between them. The conductivity of the soil is relatively poor when it is dry, so the resistance between them is higher. The output of the Soil Humidity transducer is an analog signal, so we get the voltage value through the analog input. USAGE: After this automatic watering system power on, it will judge whether it needs to pump water to water the flowers according to the signal returned by the Soil Humidity Transducer. APPLICABLE: Friends who often travel far away or those who are inconvenient to take care of potted flowers at home want to have a device that can automatically water flowers, so that the flowers and plants at home can be automatically watered. Specification: Material: Wood Size Chart: 9.3cmx9.5cmx16.5cm / 3.66inchx3.74inchx6.50inch Package Includes: 1 Set Science Experiment Wooden Irrigation System Note: 1. This is not infant toy, please take away from children to avoid eating. 2. Please allow slightly errors due to manual measurement and different monitors.