1. Based on the 40-pin GPIO interface, it is suitable for a series of motherboards.<br>2. It uses relays, allowing the connection of loads: less than AC 250V, 5A or less than DC 30V, 5A.<br>3. It is equipped with optocoupler isolation to avoid interference from high-voltage circuits.<br>4. It comes with a relay indicator light for easy viewing of the relay's working status.<br>5. It comes with a relay jumper cap for easy switching to other pins for control.<br>6. Product Name: Relay Expansion Board<br>7. Load: Less than AC 250V, 5A or less than DC 30V, 5A<br>8. Applicable Models: Suitable for 4B/3B/3B+, Nano<br>9. Product Size: 65.15×56.21 mm<br>10. Color: Blue<br>11. Material: PCB + Metal<br>12. Package Contents:<br> - One 3-channel relay board<br> - One pack of screws<br>13. Only the above items are included in the package, and no other products are included.<br>14. Note: Light reflection and different monitors may cause slight differences between the color of the item and the actual object. The allowable measurement error is plus or minus 1 - 3 cm.