perfect, heating system or not was to stay there was support, the button is lit like a interrupeteur at ca res can remain on, it does not but it goes off heated to a certain heat any more, even if you leave heat long heat will not increase more, for I am against you agree to 15 minutes, ptete it heats in 15 minutes, but the wax does not drip it must wait at least 30 40 minutes, so that the wax flows, hence the usefulness of a button or you do not stay above the finger!