6$/2PCS
4 relay expansion board
Can control a variety of household appliances, and high current load
[functions]
The large electric current relay, AC250V 10A DC30V 10A
The contact part of independent wiring, safe and reliable
A standard interface, can be extended in various development board
Provided with a fixed screw holes, convenient installation
Suitable for 51/AVR/AVR/ARM platforms
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[including] products
The 4 relay expansion board piece
Schematic can provide (network transmission) PCB diagram does not provide