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Description:The module complies with international safety standards, the load control area and regional isolation tank; With power and relay action indicator, when connected, the lights on, otherwise pull off; When there is a high level voltage signal, common terminal Normally open terminal will be turned on; Relay can control various equipment and load There is a normally open and one normally closed contact; Blue KF301 terminals to the control line is more convenient. Size: 43x17x19mm. Package included: 2 pcs 1-Channel Relay Module 12V High Level Trigger Optocoupler Relay Extension Board