Specifications : 

Arduino robot kit, rain, rain, plant 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. 
Performance parameters: 
Module supply: 5V 
5-12mA quiescent current 
Relay load capacity: 250V 10A (AC) 30V 10A (DC) 
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.