Features 1、ROUGHLY MEASURE HUMIDITY: This board can roughly measure the humidity and decide the switch of the watering equipment according to the humidity 2、ROUGHLY ADJUST SENSITIVITY WITH POTENTIOMETER: The sensitivity can be roughly adjusted with a potentiometer, enough for daily use of irrigation 3、NOT REQUIRE PROGRAMMING: This product does not require programming, does not include a single chip microcomputer, just assemble according to the schematic diagram, and easy to use 4、SIMPLE POWER SUPPLY: The power supply is simple, you can use a power bank (5V DC) as the power source, or use 4pcs AA battery boxes and install batteries for power supply 5、SOIL MOISTURE PROBE: Automatic irrigation module DIY kit with soil moisture probe, provide intelligent detection and sensing Specification Item Type: DIY Electronic Watering Kit Power Supply Voltage: 5V​ Package List 1 x Relay Module 1 x Soil Moisture Probe 1 x Comparison Module 1 x Small Water Pump 1 x Battery Case 1 x Silicone Water Pipe(default about 90cm) 12 x Jump Wire