The seller is extremely attentive I bought the wrong product (my mistake I didn´t realize my house was built without neutral wire for the switches) and even though, the seller has provided me support about it, explaining that would be better to add a neutral wire than a capacitor.
Really good product. The assembly isn't hard to do. Just watch some videos on YouTube and everything should go fine. The only con is that you have to choose between VENTILATION and EXHAUSTION. Works fine with Alexa voice command!