1. A system problem prevented connection.
 2. Bluetooth speaker setting error.
 The solution is as follows:
 The mobile phone or tablet can search the Bluetooth speaker, but after selecting it, the user will be prompted that the speaker cannot be connected.
 1.1 Connect the Bluetooth speaker to other devices to see if there is a problem with the speaker.
 1.2 Check whether Bluetooth software has been installed recently. If so, it is recommended to uninstall it.
 1.3 Restore the phone to factory settings.
 1.4 Restart the mobile phone.
 How to connect a Bluetooth speaker to a mobile phone
 1. It is recommended to fully charge the Bluetooth audio before use. Charging method: Insert the charger plug into the charging socket of the Bluetooth audio, and then connect the charger to the AC power supply or personal computer. The charging indicator lights up when charging, but does not light up after charging.
 2. Turn on Bluetooth audio.
 3. Turn on the Bluetooth function of your mobile phone and search for Bluetooth devices.
 How to connect a Bluetooth speaker to a mobile phone
 4. Open Bluetooth on the mobile phone to find the Bluetooth device, which is available in the password manual. The general password is 0000 or 1234.
 5. When connected, the Bluetooth audio will beep.
 6. Then you can listen to music, answer the phone and wait.