Secret Science Anti Gravity Revealed Homemade

This is an amazing video of a guy levitating a card with a cd, a cellphone, a Pepsi can and some batteries. I don't know if it's real or not because there's no explaination of how it works but it sure is cool. I actually found 2 videos of 2 different people doing this.

Here is the first video







Here is the second video which is a response to the first.





There is also a video response of someone saying they are using strings to lift the card but I didn't see any strings. Could still be a hoax though. But it sure is pretty cool.