This is a cardboard virtual reality (VR) headset, often referred to as Google Cardboard or a similar variant. It's a low-cost VR viewer made of foldable cardboard that can hold a smartphone.

The text on it — “3D STUDIO: Joy of Virtual Reality” — suggests it's branded for promotional or educational use. When used with compatible apps or videos, you can experience 3D and 360° content by looking through the lenses inside while your smartphone displays VR content.