GEREE DC 5V 8 Channel Relay Module with Optocoupler Driver High Low Level Trigger 8 Channel Optocoupler Driver Relay Module.Module size: 141.5mm * 50mm* 18.5mm. Working voltage : DC 5V. Trigger current : 5mA. Maximum load on normally open pin: AC 250V/10A, DC 30V/10A. There are so many options, why Choose Us--All Our Products are Produced under Strict Quality Inspection--30-Day Money Back Guarantee--12 Month Replacement Warranty--Lifetime Support Guarantee--Professional After-Sales Team to Make Things Right within 24hrs.