Hi, I was hoping that someone could advise me.

I want to take this couse - Offensive Security Wireless Attacks", also known as "BackTrack WiFu"

The URL says I should use this card - ALFA Networks USB 500mw (USB wireless Adapter capable of Injection)

There are 2 of them on Amazon - I want to know if they are both the same and if they both will work with the course. I want the one recomened to use with the WiFu course

Alfa Wireless-N 500mW 802.11n high power Wireless USB adapter With Antenna and Mount LINK

USB 500mW WiFI Adapter for Wardriving & Range Extension LINK
This one says "Packet Injection in Linux" and I think it is the correct one?