CUDEVS VRSN89 Virtual Reality Headset, 3D VR Glasses Smartphones Revolutionary tech: Turn your smartphone into a virtual reality viewer, high-definition optical resin lenses to get the most immersive 3d viewing. Connectivity Technology: Wireless T-shaped headband: This adjustable t-shaped strap is made of lightweight material Protect your eyes & radiation protection: No side effects for your eyesight Very easy to adjust pupil distance (pd) and focal distance (fd) to get the best 3d immersive experience