How to connect your phone via Bluetooth and switch to FM radio? (Note: K66-1 version supports Bluetooth only.) Plug in headphones or a speaker with a 3.5mm jack into the headphone port. Press and hold the Bluetooth power button for 3 seconds to turn on the device. Press the FM button to toggle between Bluetooth and FM radio modes. - When connected to a mobile phone via Bluetooth, the blue LED stays lit. - When in FM radio mode, the blue LED flashes. To pair with your phone: 1. Turn on Bluetooth on your phone. 2. Search for and select the device named “HC01”. 3. Once paired successfully, the blue LED remains steadily lit. 4. Play audio from your phone through the connected headphones or speaker (3.5mm). 5. Press "+" or "-" briefly to skip tracks; hold "+" or "-" to adjust volume. You may also control volume directly from your phone. For FM radio: - Press the ▶ button to start automatic station search and save channels. - Press "+" or "-" briefly to switch between saved stations. - Hold "+" or "-" to adjust FM volume. Note: Tape playback is not available when using Bluetooth or FM radio modes. How to connect a Bluetooth receiver (e.g., for tape playback): - Ensure the Bluetooth receiver is powered on. - Press and hold the Bluetooth power button for 3 seconds to activate Bluetooth mode. The white LED will flash rapidly while searching and pairing automatically. - Once paired, the white LED stays lit. - Insert a tape and press “PLAY” to begin playback. Important: Do not plug headphones into the headphone jack during Bluetooth pairing — this will prevent automatic connection. To turn off Bluetooth: Press and hold the Bluetooth power button for 3 seconds. If no Bluetooth device connects within a set time, the system will auto-shut down Bluetooth and the white LED will flash before turning off.