Positive 5V: + 5V positive power supply, input or output<br> GND: power ground, input or output<br> P30 - P35: CH3 - CH8 control lines, high level effective.<br> : short and to the module power settings to restore the factory settings<br> Blue Terminals: Connect user load, you can use 220V AC, or less than 30V DC equipment, which can not exceed the current standard load relay. Each relay has a normally open contact, a normally closed contact and a common contact, relay timely, public contact and normally open contact conduction; relay released, public contact and normally closed contact guide pass.AH893<br> Material: plastic, metal<br> color: red<br> Size: 70X 50mm<br> Package Included:<br> 1x LAN Ethernet 2-way Delay Time Switch Relay Board UDP Controller Module<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.