Basically it lets you listen to your music (and now also play videos) in your phone on any browser. I find it useful if you have speakers connected to your computer and you just like to shuffle your music. It's super simple to use, and unless you have some strange settings in your phone you don't need to configure anything, just be connected to a wifi network both in your phone and computer.
Unfortunately only for Android for now and can be downloaded here:
https://play.google.com/store/apps/details?id=com.weezzler.a...
Hope someone finds it useful, thanks!