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 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 automatic shutdown. Input voltage:DC 5V (2 x AA batteries)(Not included batteries) Output voltage:DC 5V Output current:Less than 400mA Output power:Less than 2W Audio track form:Two-channel stereo Tape speed:4.765% standard Bluetooth version:V5.0 Transmission distance:10M (no obstacles) How do a tape? 1. Headphone jack: use the headphone insert slot to enjoy music 2. When playing music, you can use the volume control knob to adjust the volume 3. Press the "DIR" button to automatically reverse the tape 4. Press the "PLAY" button to play the tape 5. Playback mode: Select the action when the tape reaches of one end, when set to the loop position, the tape be self-contained, When set to a single , the tape automatically stop playing the tape after the playback of one side is completed 6. Press the "F.F" button to fast-forward the tape 7. Press the "REW" button to rewind the tape 8. Press the "STOP" button to stop playing the tape Colour:Black Material:Plastic Package Contents: 1 * Retro Stereo Cassette Player Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.