Dear Keyboard users, I have not yet bought this product, but think about it after. As for the question of how to enter the "@" sign, I'm not sure if the same applies to this keyboard as my MacBook Pro, but it seems likely that the Apple Command key is also available. So I'm assuming that this is a tailor-made for OS X and iOS hardware.
Conclusion: try and see the combination of the right ALT key + "L".
