1. Size: 50.5mm(L)*38.5mm(W)*18.5(H)2. Weight: 31g3. PCB color: black4. There are 4 screw holes around the edge of the board, and the hole diameter is 3.1 mm, which is convenient for installation and fastening.5. The relay adopts the Songle relay, unipolar and double throw. One common end, one normally open, one normally closed 6. Optocoupler isolation, good anti-interference7. Low-level pull-in, high-level release. The status indicator lights up when pulled in and turns off when released.8. VCC is the system power supply and JD_VCC is the relay power supply. Simply connect the jumper cap.Electrical parameters: Supply voltage: 5VDC Current: over 100mA Load: 250V 10A AC or 30V 10A DCWiring instructions:VCC: The system is positively poweredGND: The system power is negativeIN1-IN2: Relay control port(Please do not reverse it; if the module burns out, we will not accept returns or exchanges.)