How do I turn down the Bluetooth volume when turning on my hoverboard

If your hoverboard has a bluetooth speaker built into it that you can use to play the music from your phone or other mobile device when riding you will notice that when you turn your hoverboard on a loud voice will say “Bluetooth mode, the bluetooth device is ready to pair” This lets you know that the bluetooth is working and you can now pair your phone to the speaker. As far as we are aware there is no way to turn down the volume of the bluetooth speaker when first  turning on the hoverboard. While riding you can adjust the volume using your phone’s volume controls.