sanag A11S Pro Bluetooth Headphone User guide

Hello! I've reviewed the user manual for the sanag A11S Pro bone conduction Bluetooth headset. This manual contains all necessary information about device operations like Bluetooth pairing, music control, call handling, and charging. I am ready to answer your questions about the device, its functions and capabilities.
How do I turn on the headset?

How do I switch between Bluetooth and TF card mode?

How can I answer a call?

How do I charge the headset