Feature: 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 Module1 x Soil Moisture Probe1 x Comparison Module1 x Small Water Pump1 x Battery Case1 x Silicone Water Pipe(default about 90cm) 12 x Jump Wire Note: 1. The kit is a spare part, you need to wire it yourself, or even welding it, there is a schematic diagram for specific wiring method.2. This product does not require programming, nor does it include a microcontroller, so buyers please do not force us to provide the code.3. This product does not provide power, you can use a power bank (5V DC) as the power source, or use 4 x AA battery boxes and install batteries for power supply.4. Do not pour water directly on the probe. Many people don't know this. When the humidity of the water is high, it will rust and break.