1. Whether the distance between the device and the mobile phone is too far: the Bluetooth connection effect will be weakened beyond 7 meters;
2. Confirm whether there are obstructions between the device and the mobile phone, the human body, metal jewelry, etc. will interfere with the Bluetooth connection;
3. Whether the power of the equipment is sufficient, it will affect the use under low power;
4. Whether the Bluetooth function of the mobile phone is abnormal, it is recommended to close the program and restart the Bluetooth;
5. After the APP exits, it will cause the connection to be disconnected. The Android system recommends opening the background running permission, and the ios system recommends keeping the background running;
6. If it is an iPhone, check whether the phone is bound to too many Bluetooth devices, please ignore several devices in the system Bluetooth settings;
7. If the above operations cannot be resolved, please restart the Bluetooth or mobile phone.