How to connect my phone Bluetooth and switch FM radio (Note: K66-1 version only has mobile phone connection function). Insert headphones (or speakers equipped with a 3.5mm jack) into the headphone jack, long press the Bluetooth start button for 3 seconds to turn on, press the FM button to switch between mobile phone Bluetooth or FM radio, the blue LED light will be on for a long time when the mobile phone Bluetooth is connected, and the blue LED light will flash when the FM radio is on. When Bluetooth connection is prompted, turn on the Bluetooth of the mobile phone, search and pair the device named HC01, the blue LED light will be on constantly after the Bluetooth connection is successful, play the music in the mobile phone through the headphones or speakers with a 3.5mm jack, short press the + or - button to switch, long press the + 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 recording of broadcast channels, short press the + or - to switch broadcast channels after channel recording, and long press the + or - to adjust the volume. When connecting to the mobile phone's Bluetooth or switching to FM radio, the tape cannot be played. How to connect a Bluetooth receiver Ensure that the Bluetooth receiver is powered on. Long press the Bluetooth start button for 3 seconds to turn on the Bluetooth function, the white LED light will turn on and flash quickly, automatically search and pair the Bluetooth receiver, when the device has been paired, the white LED light will be on constantly, after the tape is loaded, press the PLAY button to play the tape. When Bluetooth searching and pairing, the headphone jack cannot be inserted into the headphones, otherwise automatic search cannot be performed. Long press the Bluetooth on button for 3 seconds to turn off Bluetooth, Bluetooth startup mode, if there is no Bluetooth receiver connected for a long time, the LED white light flashes Bluetooth automatic shutdown. Input Voltage: DC 5V (2 x AA batteries) (batteries not included) Output Voltage: DC 5V Output Current: Less than 400mA Output Power: Less than 2W Audio Track Format: Two-channel stereo Tape Speed: 4.765% standard Bluetooth Version: V5.0 Transmission Distance: 10M (no obstacles) How to play a tape 1. Headphone Jack: Use the headphone jack 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 turn the tape 4. Press the PLAY button to play the tape 5. Playback Mode: Select the action when the tape reaches the end, when set to loop mode, the tape will be self-contained, when set to single, the tape will 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 Color: 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 to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.