For this issue, please follow the steps below to troubleshoot:
1. Bring the phone and speaker closer together and try connecting again;
2. Please press and hold the button "+" and the button "-" at the same time for 10 seconds to restore factory settings. At the same time, delete the connection records on the phone, restart the phone, and try again;
3. Change the phone and the usage environment and try connecting again;
4. If the above methods are not effective, please apply to the local after-sales service center for inspection and repair.