Questions about Microsoft Arc Wireless Keyboard - Xbox360 - ArcadeStick

First of all I know that both of them are stupid questions. But I’d really appreciate it if you would answer them.

I have an Xbox360S and a Hori Real Arcade Pro VX SA.
I want to buy the Microsoft Arc Wireless Keyboard.

So, is that keyboard compatible with my Xbox and will I be able to chat and send mesages to my friends using it?
Also (here comes the stupid question) this keyboard has a magnet so you can put the tranceiver under it and keep it there. ( Will the magnet affect any of my other devices and especially my arcade stick, if it gets near it?

It will probably work with the 360, but I dont have any guarantees.
No, magnet will not affect anything.

Thank you very much for your response. It really helped.