All the way back in January 2015, security researcher Samy Kamkar developed a keylogger that's disguised as a wall charger that can record information from Microsoft wireless keyboards from a wall socket.
The scary device can actually record everything you type on the keyboard like passwords, credit card numbers and more. It can even send text message alerts to the owner to let them know when you're typing specific words. That's useful if they're trying to steal passwords to specific websites.
But what's more worrisome is that the FBI didn't issue a warning about the keylogger until April 29, 2016. The FBI couldn't comment on any specific attacks - or if there are any specific threats, but if they issued the warning, logic says it is being used for nefarious purposes.
The price of KeySweeper will depend on everything the owner wants it to do, so it could cost $10 to $80. It can store keystrokes on the gadget or online.
KeySweeper only works on Microsoft wireless keyboards, but it's still unclear how many models the gadget works with. It takes advantage of some flaws in the keyboards to steal the information.
KeySweeper exploits multiple bugs, including the fact that all Microsoft keyboards use the same first byte in their MAC address. Along with a few other holes, it can thus allegedly decrypt any Microsoft keyboard nearby without having to specify its MAC address first.
The best way to keep your computer safe would to be avoid using Microsoft wireless keyboards when you're out in a public place where someone could plug a KeySweeper into the wall. Microsoft is aware of the problem and is currently investigating the situation. Kamkar actually designed the device to bring attention to the lack of security on many wireless items.