@Taiane **********
the METV is a visa you BUY from the thai consulate in your country before you come here,
it's good for 6 months from the date it's issued,
it's good for unlimited entries during that time of 60 days each,
and
if you work the exit/re-enter part correctly you can get almost 9 months of stay out of that visa
GO to the website of the thai consulate in your country and read the requirements.
You cannot get it in S/E Asia from any thai consulate, only from the thai consulate in your country before you come here