razer seiren v2 x headphone port (jack)

Dear razer support,
I am asking question about (razer seiren v2 x) device.
Is the headphone port on the back of the microphone only for monitoring in and outgoing voice or can i use it for listening music and stuff (like playing game , casual use).
because my computer headphone port (jack) seems broken because when i start play a game i hear some sizzle on my left side ( no problem when i'm not playing games)
maybe it can be useful when using iphone earphone on computer.
Sincerely,