This app is absolutely garbage. When I use it with my Chromecast for screen mirroring the audio and video stutters, and sometimes the audio goes off completely, and often it just disconnects for no reason. A Samsung tech assured me there was a problem with my wifi connection. I was on a wireless N network, on a home router with only 2 other users, on fiber-optic internet. I regularly hit 3 MB / sec download speeds. It is NOT my internet, but the Samsung tech wouldn't consider any other problem