How do I connect my phone Bluetooth and switch FM radio? (Note: K66-1 version only has mobile phone connection function). Earphone (or speaker equipped with 35mmAx plug) into the headphone jack, long press the Bluetooth boot button for 3 seconds to turn on press the FM button to switch the mobile phone Bluetooth or FM radio, the LED blue light is long when the mobile phone Bluetooth is connected, and the LED blue light flashes when FM radio. When the voice prompts the Bluetooth connection, turn on the Bluetooth of the mobile phone, search and pair the device name "HC01", the LED blue light is always on after the Bluetooth connection is successful, play the music in the mobile phone through the headphones or speakers with 3.5mm connector, short press the "+" or "-" button to switch songs, long press "+" or "-" to adjust the volume, or directly use the mobile phone to adjust the volume. When using FM radio mode, press the symbol ▶ button to start automatic search and record broadcast channels, short press "+" or "-" to switch broadcast channels after channel recording, and long press "+" or "-" to adjust the volume. When connecting to mobile phone Bluetooth or switching to FM radio, the tape cannot be played. How do I connect a Bluetooth receiving device? Please make sure that the Bluetooth receiving device is turned on. Long press the Bluetooth boot button for 3 seconds to turn on the Bluetooth function, the white LED light lights up and flashes quickly, automatically search and pair Bluetooth receiver, when the device is successfully paired, the white LED light is always on, after loading the tape, press the "PLAY" button to play the tape. When Bluetooth search pairing, the headphone slot cannot be plugged into the headphones, otherwise the automatic search cannot be made. Long press the Bluetooth power on button for 3 seconds to turn off Bluetooth, Bluetooth boot state, if there is no Bluetooth receiver connected for a long time, LED white light flash Bluetooth a