Reviews Description: Specifications: Material: high-quality and recycled paper. Operating System: No need Virtual screen: 3.5~6 inch Menu Language: No need Resolution Based on the film source Color Bit Based on the film source Video: Left-right 3D Connector: No Certification: No Headband Girth: 20~40cm Weight: 50g Steps to install: 1.Tear off the seal of JoyGeek Cardboard.(You will see these words) 2.Take apart the cardboard from the "Detach here". 3.Find the "Star Here",from this to start to assemble insert the numbered tags into their corresponding slots. 4.Use tape or glue to make the cardboard sturdy. 5.Affix the NFC tag on the back cover and install the headband. Note: 1.Pls search"Google Cardboard" in Google Play and Apple APP Store. 2.Whether your phone system is Android or other systems,you can use the Cardboard to watch Left-right 3D movies on Video Player and play varieties of VR games. 3.More than 300 virtual reality apps on Apple App Store and Google Play Store for you download to enjoy shocking 3D effect.