I need to get a Peltier tile/plate for one of my projects and I got really confused when deciding between them based on No. codes on it, as they're all similar in dimension. Like for example, I was looking for 4cmx4cm Peltier plate, and I found myself getting confused when there were choices like TEC1-12710, TEC1-12706, TEC1-12705, and I'm not sure if there's even more. So what are their differences and what do those No. codes even represent?