How to turn on phone volume synchronization：
In the "Headphone Safety" option of iOS phones, there is a "Reduce Loud Sounds" function. It is turned off by default. However, if you have manually turned it on before, the headphone volume will be limited and cannot reach the maximum volume.
There is a function option on Android phones: "Synchronize Bluetooth device volume with mobile phone", and some models are turned off by default. At this time, when adjusting the volume through the mobile phone, you can only adjust the mobile phone volume, and cannot synchronize the headset volume; so There may be a problem that the volume of the mobile phone is adjusted to the maximum, but the sound of the earphones is still too low.
Therefore, when you feel that the volume of your Bluetooth headset is low, you can refer to the following operation examples to solve the problem:
(Please note that adjusting the phone settings may cause the headphone volume to change suddenly. Do not wear headphones at this time.)•
Apple（Example：iOS14.3 Version）
Check the path: Settings------Sounds & Haptics---Headphone Safety---Reduce Loud Sounds
HUAWEI /HONOR phone（Example：HUAWEI NOVA 10）：
Path: Bluetooth---Sync volume with phone
Xiaomi / Redmi phone（Example：Redmi Neo 5 SE）：
Path: Bluetooth---Device volume sync
OPPO phone （Example：OPPO Find X5 pro）
Path: Bluetooth---Device volume sync
VIVO phone （Example：VIVO ）
The volume synchronization function is turned on by default on this phone. If you are not sure whether you have changed the settings before, please check according to the following path:
Path: Enter *#*#7777#*#* on the dial pad to enter the developer options---swipe down to find the "Disable absolute volume " switch---make sure this option is turned off.
Samsung phone（Example：Galaxy F52）
The volume synchronization function is turned on by default on this phone. If you are not sure whether you have changed the settings before, please check according to the following path:
Path: Settings---About Phone---Software Information---Click "Compilation Number" multiple times (the prompt "You are already in developer mode" will appear below)---Return to Settings---Develop Options---Scroll down to find the "Disable absolute volume function" switch---Please make sure this option is turned off.
MEIZU phone（Example：MEIZU18）
Path: Bluetooth---Device volume sync
ZTE phone（Example：ZTE Axon 30 Ultra）
The volume synchronization function is turned on by default on this phone. If you are not sure whether you have changed the settings before, please check according to the following path:
Settings---About phone---Click Android version number---click "Version number" multiple times (a prompt "You are already in developer mode" will appear below)---Return to settings---System Update---Developer Options---Scroll down to find the "Disable Absolute Volume Function" switch---Please make sure this option is turned off.
SHARK phone（Example：SHARK 3）
The volume synchronization function is turned on by default on this phone. If you are not sure whether you have changed the settings before, please check according to the following path:
Settings---My Device---All Parameters---Click "Version Number" multiple times (the prompt "You are already in developer mode" will appear below)---Return to Settings---More Settings---Developer Options---Scroll down to find the "Disable Absolute Volume Function" switch----Please make sure this option is turned off.
Nubia phone（Example：nubia 6Pro）
The volume synchronization function is turned on by default on this phone. If you are not sure whether you have changed the settings before, please check according to the following path:
Settings---About the phone---click "Version Number" multiple times (the prompt "You are already in developer mode" will appear below)---return to settings---advanced settings---developer options ---Scroll down to find the "Disable absolute volume function" switch---Please make sure this option is turned off