You probably know that when you plug one of the new 12inch MacBooks into a power source it’ll make a chime noise (the same as iPhones and iPads). But did you know you can make your MacBook Pro or MacBook Air do the same thing? All you need is OS X Yosemite 10.10.3 or later and you can enable this cool little trick with 1 quick line in Terminal. It’s also extremely easy to turn it back off again if it gets on your nerves.
You need OS X Yosemite 10.10.3 or above to do this.