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There’s almost nothing more private on your computer than the keystrokes you type in.
Think of typing your passwords, all your emails and instant messages, your Social Security number and credit card numbers, and even more private information meant only for the eyes of a select few. Now imagine all of those sensitive details landing in hands of strangers.
American and Chinese academics built a keystroke recognition system called WiKey consisting, at its simplest, of a standard router (sender) and laptop (receiver). WiKey can recognize typed keys in the middle of the system based on how the Wi-Fi signal lands on the receiver.
More on : http://news.hcnepal.com/2016/09/02/hackers-can-track-your-keystrokes-through-your-wi-fi-signal-hc-nepal/