The FBI is warning actors in the private sector about a keystroke loggers disguised as USB phone chargers. The FBI issued a Private Industry Notification warning of the abuse of KeySweeper components that are able to sniff everything users type into wireless keyboards. The device is a cheap USB wall charger that can eavesdrop on almost any Microsoft wireless keyboard. It is able to store the sniffed keystrokes both online and locally on the device. The instructions on how to build the device are available online on GitHub.”]
Source: https://securityaffairs.co/wordpress/47637/hacking/fbi-notification-keysweeper.html