1)High-quality 5v relay. 2)Have relay status indicator led. 3)Easy to use, simple 3 line structure. 4)It is also able to control various appliances and other equipment with a large current. 5)Widely used for all MCU control, industrial sector, PLC control, smart home control. Specifications:Channels: 1/2/4/6/8 Connects directly to a microcontroller