Recently I've decided to buy another monitor to use while working.I searched not only for led monitors because there was not just one single problem :) Another problem was that to transfer specific part of my screen view to the new monitor because I'm the one of fans of apple products and also the fanatic one of mac book air users :) ( I'm using a Mid 2012 Mac book air and it has just 2 USB ports and 1 thubderbolt port.)I'm using thunderbolt port for my first external monitor so there is no other option wihout using USB port to transfer my screen data to another external monitor..
I found that device (this link) and it also has MAC OSX driver.( the best of part my little story :) ) it's updated for MAC OSX Yosemite 10.10.1 !! it's pretty cool ha ! :)
btw don't try to use S-link and its crap adapter series!Don't even think about it..I lost 2 hours when I was checking whether it's compatible or not!
The device (above) is USB 2.0 compatible and works by shine in 1920*1080 resolution mode but if you buy 3.0 version of this device (DA-70450
) then you can use your monitor ( if your monitor is supported for this resolution!) up to 2048*1152 resolution!
have a nice day!