Vivo Y83 Pro has the same aperture of f/2.0 on both sides of cameras.
Yes, Vivo Y83 Pro does have the dual camera support. It has 13MP + 2MP dual rear camera.
Yes, Vivo Y83 Pro does have a dedicated MicroSD card slot.
Yes, Vivo Y83 Pro comes with the earphone in the box. The other accessories include - power adapter, USB cable, protective case, sim ejector tool and quick start guide.
Yes, Vivo Y83 Pro does have the face unlock feature.