Features: For Arduno robot kit, rain, rain, plants foliage and humidity sensors can be used to monitor a variety of weather conditions, and with relay output directly control the motor and other startup and shutdown. The sensor uses a high-quality double-sided FR-04 materials, the large area of 5.0 x 4.0CM, nickel-plated surface and has antioxidant, conductivity, superior performance and lifetime aspects. The module directly with power relays, direct load control. Adjust the sensitivity of digital distribution, control at different moisture control open relays. When connected to power, the power indicator light, the sensor board does not drop, the relay does not operate, switching lights off, drop a drop of water, the relay start related equipment, switch indicator light, Wipe off water droplets above, and restored to the original state. Package Includes: 1x 12V Raindrops Controller Module Specifications: Material: PCB Motherboard Size: 6X3.5cm/2.36x1.37inch Module supply: 12V :5-12mA quiescent current Relay load capacity: 250V 10A (AC) 30V 10A (DC) note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.