Thai singer with male and female voices

This is the video link from youtube sent by a friend of mine from facebook. Well, i kind of didn't understand it at the beginning. I mean when she started her (or his) singing i was like, 'it wasn't that good but it was okay'. Then few second later her voice completely changed to a male's voice. I was shocked!!! I mean i thought there was a backup singer then it there weren't any. So i think you guys should watch this Thailand Got Talents clip!!! It's amazingggg LOL! I just impressed but when i think back about what how she was, then i can accept the fact that she can sing with a male voice.

P/S: It's hilarious seriously!!!