Black Retro Stereo Cassette Player Walkman with Bluetooth How to connect your phone via Bluetooth and switch to FM radio: (Note: K66-1 version supports mobile phone connection only). Insert an earphone or speaker with a 3.5mm plug into the headphone jack. Press and hold the Bluetooth button for 3 seconds to turn on the device. Press the FM button to switch between mobile phone Bluetooth and FM radio mode. A solid blue LED indicates a successful Bluetooth connection, while a flashing blue LED indicates FM radio mode. When prompted for Bluetooth connection, enable Bluetooth on your mobile phone, search for the device named "HC01", and pair it. Once connected, the blue LED will remain steadily lit. Play music from your mobile phone through headphones or speakers with a 3.5mm connector. Short press the "+" or "-" button to switch tracks, long press "+" or "-" to adjust volume, or control volume directly from your phone. In FM radio mode, press the scan button to automatically search and save broadcast channels. After saving, short press "+" or "-" to switch between channels, and long press to adjust volume. Note that cassette playback is disabled when connected to mobile phone Bluetooth or in FM radio mode. To connect a Bluetooth receiving device: Ensure the Bluetooth receiver is powered on. Press and hold the Bluetooth button for 3 seconds to activate Bluetooth. The white LED will flash rapidly while searching. Once paired successfully, the white LED will stay on continuously. After inserting a cassette tape, press the "PLAY" button to begin playback. During Bluetooth pairing, do not insert headphones into the headphone jack, as this will prevent automatic pairing. To turn off Bluetooth, press and hold the Bluetooth button for 3 seconds. If no Bluetooth device is connected for an extended period, the white LED will flash and the Bluetooth function will automatically shut down. 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: Up to 10 meters (no obstacles) Cassette Operation Guide: 1. Headphone Jack: Insert headphones to listen privately 2. Volume Control Knob: Adjust sound level during playback 3. DIR Button: Automatically reverses the tape 4. PLAY Button: Start tape playback 5. Playback Mode: Choose loop mode for continuous playback or single mode to stop after one side finishes 6. F.F. Button: Fast forward through the tape 7. REW Button: Rewind the tape 8. STOP Button: Stop playback Color: Black Material: Plastic Package Contents: 1 x Retro Stereo Cassette Player (Other accessories not included) Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement error allowance is +/- 1-3 cm.