Hello, I have a macbook air and am looking for a portable second monitor. I would like to use the second monitor as an extension for purposes related to videos, word, excel, basically just more screen space. I have done some researching and have found three models: the AOC E1649FWU 16" USB-Powered Portable LED Monitor, the Lenovo ThinkVision LT1421 14" Widescreen LED Monitor, and the Toshiba 15.6-inch USB 3.0 Mobile LED Monitor. I was wondering if anyone owns any of these or has any opinions for me. Also i was wondering if they make a portable monitor for a mac but that can also be used for an iPhone. Thanks for any help!