Positive 5V: +5V power supply, input or output GND: Power ground, input or output P30 - P35: CH3 - CH8 control lines, high level active CLR: Short CLR to restore module to factory settings Blue Terminals: Connect to user load; compatible with 220V AC or DC equipment under 30V, within relay current rating Each relay includes one normally open contact, one normally closed contact, and one common contact When energized: common contact connects to normally open contact When de-energized: common contact connects to normally closed contact AH893 Material: Plastic, Metal Color: Red Size: 70 x 50 mm Package Included: 1 x LAN Ethernet 2-way Delay Time Switch Relay Board, TCP/UDP Controller Module Note: Lighting and display differences may cause slight color variation between image and actual item. Measurement tolerance: +/- 1-3 cm.