This is a simple water sensor that can be used to detect soil moisture. It can be used in plant watering device, and the plants in your garden no need people to manage.   Features:   Simple water sensor, which can be used to detect soil moisture.   Adjustable sensitivity by adjusting the digital potentiometer.   LM393 is used as comparator chip, stable performance.   Dual output mode, more accurate with analog output.   With power indicator and digital switching output indicator.   It's helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden.   Specifications:   Comparator Chip: LM393   Operating Voltage: 3.3V~5V   PCB Size: 32 * 14mm   Soil Probe: 60 * 20mm   Cable Length: 20cm   VCC: 3.3V~5V    GND: GND   DO: Digital Output Interface(0 and 1)    Package Size: Approx. 10 * 5.5 * 3.5cm   Package Weight: 36g   Package List:   5 * Moisture Sensor Module    5 * Soil Probe    10 * Jumper Cable