PS4 connected to Monitor but sound's a problem

Okay so I connected my PS4 to my monitor via HDMI. My monitor doesn't have speakers....

So what am I supposed to do ?

Any cheap speakers with optical output ? Do bluetooth speakers work with Ps4 ??

NOOOOOOOO ?

Headphones?

where do I connect the headphones ? No Aux input

OMG I fixed it, I just bought the PS4 so I'm really new to this

thanks mate