If you want it permanent for a few months, there's one type that extend using both clips and glue. If it use either clips or glue only, it can only stay for a month or so.

But using both can make sure it stays for more than two months. But having glue in your hair, you couldn't style your hair using hot iron curl or straightening because it will melt the glue and your hair will get tangled.

So you have to really take good care of them after you get the hair extension to avoid tangles and everything.