How can I control my VWS X1 (Headphones) using the buttons?

Below are the button functions for the VWS X1 (Headphones):

Left Earcup
1. Power Button
(1) In Power-off mode: Hold for 3 seconds to power on; Hold for 8 seconds to enter Bluetooth pairing mode.
(2) In Power-on mode: Hold for 3 seconds to power off.
(3) In Call mode: Press once to answer the call; Press and hold to reject the call; Press once to hang up.
2. Type-C Charging Port
Use the included 1-meter Type-C charging cable and your phone’s original charging adapter to charge the VWS X1.
3. Headphone Jack
Equipped with a 3.5mm headphone jack; headphone wire is not included.

Right Earcup
1. Volume Control
“+”: Press once to increase volume; Press and hold to go to the previous song.
“-”: Press once to decrease volume; Press and hold to skip to the next song.
“+” & “-”: In power-on mode, hold both buttons simultaneously for 5 seconds to reset to factory settings.
2. Noise Cancellation
Press once to cycle through the three modes: Off, Noise Cancellation, and Transparency.