ITEM NAME:DC 12V 4-CH High Low Level Trigger Optocoupler Armored Relay Module 73 x 50 E3B4 DC 12V 4-CH High Low Level Trigger Optocoupler Armored Relay Module 73 x 50 E3B4 Product Name: relay module Relay Type: SRD-12VDC-SL-C Coil Voltage: DC 12V Pulley Number: 4ch Charge: AC 250V / 125V 10Acc 30V / 28V 10A Total size: 73 x 50 x 18 mm / 2.8 inchx 2inch x 0.71 inch(L * W * T) Mounting Hole Dia. : 3mm / 0.12 inch Center Hole Distance: 67 x 44mm / 2.6 inchx 1.8inch (Length X Width) Materials: CCL Main color: Red Quantity: 1 piece Weight: 63g Package Content: 1 x relay module Only the above package content, other products are not included. Note: Light shooting 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.