Review on SainSmart 101 70 100 2 Channel Relay Module by Jason Bollinger

Can't beat this for the price, not even sure I could buy a relay for it and certainly my time building it. I like the status LEDs that light up when the relays are active. My only criticism is that the board doesn't have a standard shield size or pins that are compatible with the Arduino shield pinout, and you need male-to-female jumpers to connect it to the Arduino. Also note that the relays turn on at a logical LOW (active low) signal. Otherwise it looks like a well-made two-relay board, with each relay controlled two-pole, single-pass, and independently.