Brand N/A Model 2302 Quantity 1 Color Black + White Material Plastic + iron Features Working voltage: DC 3.3~3.5V; Humidity range: 0~100%RH; Accuracy: +/- 2%RH; Temperature range: -40~80'C; Accuracy +/- 0.5'C; Unibus digital signal output; Serial bidirectional data port. Specification Black: Ground; Red: positive power supply DC9V; White: Relay normally open; Blue: relay common Application For your DIY project English Manual/Spec Have Other Simple Test Method: Hold down the test button 3S light starts flashing the relay normally open relay with common terminal connected. Can also be smoking cigarettes the smoke blowing maze 3S so light starts flashing the relay the relay normally open to the common terminal connected Packing List 1 x Module 1 x DuPont line 20cm