Let me know if there is something more you would like me to post please. I would like to make this as complete as possible.

The Rosewill RNX-EasyN1 is a USB wireless adaptor, that supports b/g/n. Rosewill reports that the device does not function on linux. However, according to my tests (listed below) it supports both monitor mode and injection.

Tests:
Device mounts as wlan0. It uses the RT2870/3030 driver.

airmon-ng start wlan0 reports that monitor mode is functioning on mon0. aireplay-ng -9 mon0 reports that injection functions. I do not currently have a second card that supports monitor mode to check which functions it supports exactly.

Again, if you want more info (related to the device), let me know. If I can get it, I'll be happy to post it. If not, I'll ask how I should get it so that I can post it