Theres a little marble and you have to pop it inside the bottle then you drink.
Off-Topic: Whenever I scroll past your avatar, and don't really focus on it, I swear I see Snoopy.
Dunno why, I just do.
On-Topic: It doesn't look exceedingly interesting. Just has an odd-shaped bottle. Not really something that would make me want to buy it if I saw it in a shop.