The frequency range from 2.4 to 2.4835 GHz, which is unlicensed and used for many communications applications, including Bluetooth and Wi-Fi. Microwave ovens also use this frequency. See 5 GHz band, ISM band, Bluetooth and 802.11.
"2.4 GHz band." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/2-4-ghz-band>.
2.4 GHz band. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/2-4-ghz-band