A computer security research team has identified a weakness in several brands of low-cost wireless keyboards that could allow hackers to view and record every word, number and password typed by a user from up to about 75 metres away.
According to Bastille, an Atlanta-based research team, eight wireless keyboards made by companies such as Hewlett-Packard, Radio Shack and Toshiba send keystroke data from the board to the USB dongle that connects to your computer without the encryption needed to mask what someone is typing.
http://www.cbc.ca/news/technology/wireless-keyboard-security-bastille-1.3698119