- VD = Diminuir volume
- VU = aumentar volume
- PW = Botão de energia
VD, VD + PW, VD: Inicialização do USB
VU: Entre no BIOS
To boot the Microsoft Surface Pro from USB, shutdown Windows 8 first, then press and hold the Volume Down key, and then press the power button briefly while continuing to hold down the Volume down key.
If you need to change any of the BIOS options then press and hold Volume UP while powering on.
Fonte: link