How do I use my Baseus Bd1 Bean Shaped Bluetooth Earbuds if the volume is low even when they are new?

For Android devices, connect via Bluetooth and enable 'Sync Bluetooth device volume' or activate 'Absolute Volume' in Developer Options. On iOS, disable ‘Mono Audio’ under Accessibility settings and turn off 'Reduce Loud Sounds' in Sound & Haptics. Clean any foreign objects blocking the earbud outlet with a soft-bristled toothbrush dipped in alcohol if necessary. (Page 3)