They are also very very easy to fry the circuits on. I bought a module for about £300, patched it wrong, by mistake (An output to an output) and fried the circuits. I'd only had it about 2 weeks☹️. Sent it back to the manufacturer and told them it was faulty. They set me a new one (I was a bit more careful with that one, it's still alive🙏🏻).