Positive 5V 5V positive power supply, input or outputGND ground, input or outputP30 P35 CH3 CH8 control lines, high level effective. short circuit and to the module power settings to the factory settingsBlue terminals Connect load, you can use 220V AC, or less than 30V DC equipment, which can not be the current standard load relay. Each relay has a normally open contact, a normally closed contact and a common contact, relay, public contact and normally open contact line relay released, public contact and normally closed contact guide pass.AH893Material plastic, metalColor redSize 70 50mmPackage contents1 LAN Ethernet 2way delay time switch relay board UDP control moduleNote Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The measurement allowed error is 13cm.