These are very simple peltier cold plates. No instructions, hot and cold sides aren't even labeled. The printed side is considered cold. However, I wanted to be sure, so I quickly cycled the power on and off, then checked which side is hot or cold. (This happens quickly, so unless you have an efficient heatsink on the hot side, it will burn out quickly.) I use a 300 x 140mm aluminum heatsink, cooled by ten 25mm fans. (Five on each end.) A thin sheet of aluminum foil is taped to the heatsink to…