Feature 1Mature and Stable Module: This module supports I/O port as well as UART program download port all pinout, programmable keys and reset keys, mature and stable. 2Safe and Harmless: The dual relay board is equipped with WiFi and BLE modules, which are harmless to human body and provide security to the operator. 3Output Switching Signal: This relay board contains 2 way 5V relay with output switching signal, suitable for controlling loads with operating voltage of AC250V or DC30V or less. 4Large Capacity: This dual relay module has a large enough capacity of 4M, you can use it with the actual situation. 5Applicable Scenario: This dual relay module is suitable for secondary development learning, smart home, wireless control, etc. If you have related needs then this one is suitable for you.Item Type: Dual Relay ModuleMaterial: PCB Copper BoardProduct Voltage: DC5-60V .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List1 x Module2 x Double Row 10 PIN1 x Double Row 6 PIN1 x Single Wire CoverNotePay attention to correct operation.