A:AnswerAbsolutely. Not only will it work with OS X Yosemite Version 10.10.5, it will also work with your mobile devices (iPhone, iPad, etc.). It will basically connect with any Bluetooth enabled device.
A:AnswerNo it does not have backlit keys (That trend is going OUT btw). The good thing about this latest version of the keyboard is IT IS rechargeable so a man or lady in like fashion does not have to keep a stash of batteries in stock when the keystroke demands answer.