Excellent product at an excellent price! Bought 5 of these to try out and all good so far. Using custom MQTT program with Arduino IDE and works great. The button to flash is a little tricky but not to hard to get the hang of it. A suggestion is that maybe the AC labelling should be reversed so L is on the inside and N is on the outside traces. As this way the Live would be isolated at the relay and the Neutral would pass across straight to the output terminals. As it is labeled, the Live passes straight to the output terminals which poses a shock hazard. I have wired mine up the other way round and they work great and when relays are off there is no Live voltage present at the output terminals. I’m not sure if some are getting confused about the 10ohm 2W resistor but as I see it, it is only in series with the AC-DC board, not all of the AC load as others have suggested. The case isn’t ideal but that was explained in the description so that’s okay. I will be putting them in a larger case to control 2 larger contactors anyway. I didn’t see anywhere in the description about it being able to handle 10A loads, so I’m guessing others have assumed that by going off the relay ratings. With a few mods you can get more current through it. I have soldered the bare tracks on the underside of the board to increase the current capacity, it can handle 5A per channel now. You could also use wire otherwise. I would give 5 stars just for the fact the creator replies to questions and is updating the product. Thanks Chao ��
