KeySniffer vulnerability affects wireless keyboards from eight different hardware manufacturers that use cheap transceiver chips a less secure, radio-based communication protocol. The affected keyboards use unencrypted radio transmission and don’t receive security updates. This means anyone within 100 meters range of your computer and around $15-$30 long-range radio dongle can intercept communications between affected wireless keyboards and your computer. Eventually, this allows the attacker to collect everything you type, including passwords, credit card numbers, personal messages and even weird porn searches.
Source: https://thehackernews.com/2016/07/wireless-keylogger.html