Review on Lystin 4 Channel Relay Module Control Board for UNO R3 MEGA 2560 1280 DSP ARM PIC AVR TTL Logic STM32 Raspberry Pi - DC 5V DC 230V with Optocoupler by Andrew Cramer
Yours may be slightly scratched
Everything is scratched. In my analysis they stack them on top of each other and the solder joints below have hollowed out this board.
- With power indicator, 4 lane road has a status indicator. With relay coil for accommodating the diode protection.
- Expensive insurance
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