Interactive viewer! The King Cobra VR Viewer comes with a built-in trigger that allows you to interact with your apps and games. The full-size headset is designed to shield external light to enhance the realism.Now with an optional head strap you can experience virtual reality, hands free. Works with Google Cardboard. Features: 15.5" length strap, Create your own VR content with Cardboard Camera App, Larger lenses for enriched viewing, Universal - fits most smartphones with 4.7" or larger screen size, Extremely large area for your full color imprint Patent Pending