The frequency band used by CB radios in the U.S. (from 26.957 to 27.283 MHz). It is also used for wireless keyboards and mice. See ISM band.
"27 MHz." YourDictionary, n.d. Web. 16 May 2018. <http://www.yourdictionary.com/27-mhz>.
27 MHz. (n.d.). Retrieved May 16th, 2018, from http://www.yourdictionary.com/27-mhz