新嗰啲iPad無

Dynamic volume buttons adjust automatically as you rotate your iPad. So you increase volume with the button on the right or top, and you decrease volume with the button on the left or bottom, regardless of how you hold your iPad.
These iPad models feature always-on, dynamic volume buttons:
iPad Pro 11-inch (4th generation)
iPad Pro 12.9-inch (6th generation)
iPad (10th generation)
iPad mini (6th generation)
iPad Air (5th generation)
https://support.apple.com/en-us/102354