Due to compatibility issues with the Bluetooth connection preemption and dual-connection functions of the terminal device system, some devices may experience a delay in sound output when switching between dual-connection music channels or during connection preemption. This issue may occur with all TWS Bluetooth Earbuds available on the market. It is recommended that you directly connect the Earbuds to your device for experience. This is not an abnormality of the Earbuds, so you can use them with confidence.