Use headphone audio level features on iPhone
If you listen to loud headphone audio for long enough to affect your hearing, iPhone automatically sends you a notification that you should turn down the volume. After you receive a notification, the next time you plug in your headphones or connect them using Bluetooth, your volume is automatically set to a lower level. You can turn the volume up again if you choose.
Note: Depending on your country or region, Headphone Notifications may be turned on by default, and in some countries or regions, you may not be able to turn it off. If allowed in your country or region, you can turn Headphone Notifications on or off in Settings > Sounds & Haptics > Headphone Safety.
You can find headphone notifications on the Summary screen of the Health app .
Tip: To review the details of a headphone notification, tap Browse at the bottom right of Health, tap Hearing, then tap Headphone Notifications.
In addition, you can use the Settings app to set a maximum decibel level that keeps your headphone audio at a comfortable level.
Reduce loud headphone sounds in Settings
Go to Settings
, then tap Sounds & Haptics (iPhone 7 and later) or Sounds (earlier models).
Tap Headphone Safety.
Turn on Reduce Loud Sounds, then drag the slider.
iPhone analyzes your headphone audio and reduces any sound above the level you set.
Note: If you set up Screen Time for family members, you can prevent them from changing the Reduce Loud Sounds level. Go to Settings > Screen Time > Content & Privacy Restrictions > Reduce Loud Sounds, then select Don’t Allow.
Improve the accuracy of audio measurements for third-party Bluetooth headphones
Classify your Bluetooth devices as headphones, speakers, or other devices.
Go to Settings
> Bluetooth, then tap
next to the name of the device.
Tap Device Type, then choose a classification.
Headphone audio measurements are most accurate when using Apple or Beats headphones. Audio played through other headphones can be estimated based on the volume of your iPhone.