Doesnt work on Yosemite

You have to download the PC app from their only-in-Korean website. The download takes an hour or longer and then I find the dmg isnt recognized by Yosemite. No way to contact the dev, iTunes wont let me report a problem and of course their website is in Korean. Basically Ive been robbed of $10. Guess Ill know better next time. This app is a worthless piece of crap.

Porkpie Johnson about TwomonUSB - Extended Display