The RF channels used for Bluetooth Low Energy LE consist of Primary Advertising Channels and Data Channels / Secondary Advertising channels and they are ordered to avoid clashes with Wi-Fi.
Bluetooth Low Energy, BLE is the designation given to Bluetooth versions 4 & 5 which provide very low energy operation and high performance data transfer.
Bluetooth works by using low power frequency hopping signals in the 2.4 GHz band with techniques for secure pairing, profiles for a variety of applications, addresses for identification . . . .