Review on KEYESTUDIO 4 Channel Relay Shield 5V: Arduino R3, ARM, PIC, AVR, STM32, Raspberry Pi Expansion Board by Jeff Davidson

I use this shield with original Aduino uno R3. The shield only works well with Uno. However if you have an Arduino ethernet shield like in my photo. Relay number 1 uses pin 4, which is used by the Ethernet shield. So I had to remove the pin and solder pin 4 on the relay board to pin 8 since it's available. Pins 5 6 7 are used by three other relays. I hope they revise the plan so this isn't an issue in the future although I highly doubt it but I messaged Case and they confirmed me. Otherwise it works great for my applications.