Why is there a difference in volume levels when connecting the Redmi Buds 6 to different devices?

The following situations could cause automatic volume adjustments, which are all normal phenomena, so please feel free to use them.
1. When connected to Xiaomi devices, the Xiaomi volume protection mechanism automatically adjusts the volume to a moderate level;
2. When connected to iOS devices, the earbuds automatically sync to the original volume set by the iOS device;
3. When connected to other Android phones, some devices do not have absolute volume enabled. It is recommended to turn on volume synchronization between the earbuds and the phone on the Bluetooth settings page.
Note:
After successfully pairing the earbuds with the phone, when the earbuds reconnect to the phone, the volume will sync to the last set of moderate volume on the phone.