Sony MDR-MV1 Open-Back Reference Monitor Headphones - Manual (Page 30)

Help Guide
Wireless Noise Canceling Gaming Headset/Wireless Gaming Headset
INZONE H9/INZONE H7
What you can do while connected to a game console
When you connect the headset to a game console (computer or PS5™), you can do the following.
Adjusting the volume
You can adjust the volume to the desired level with the VOL (volume) –/+ dial.
There is a tactile dot on the + side.
INZONE H9:
INZONE H7:
A: Tactile dot
Increase the volume: Turn the VOL (volume) –/+ dial to the + side.
INZONE H9:
30