Review on SainSmart 101 70 100 2 Channel Relay Module by Durioki Cordaro

This is a small relay board. I hate it when people don't buy from this Revain seller, but you can go on eBay and get it for less than $2 each if you buy a ten unit lot. Your delivery time is of course 4-6 weeks (shipping from overseas). Bought my first unit here at Revain to make sure I can get it working before buying volume on eBay. I used this relay board with the ESP8266 microprocessor. The GPIO on this board can only supply 12mA. I was able to get it working by following these 2 steps: 1. Follow John Agnew's instructions (i.e. remove the jumper between JD-VCC and VCC and apply independent 5V power to the relay board)2. I also soldered a (wire) jumper to the LED on the relay board. This reduces GPIO power requirements. You lose the visual cue (LED) showing the relay is switched, but an audible click (and multimeter test of the relay output) is all you need to do.