Download and install app on your device before using. The door of the headset also has a strong magnet to ensure the door doesn’t open during video play. You can slightly adjust the position of the spherical resin lens by moving the buttons on the top. Smartphones size should not exceed 3.5~6inch. The T-shaped strap it's flexible and it molds to your head. Comes with a small instruction manual. Made with built in headsets/earphone ports. No special hardware needed. Can be paired with Bluetooth remote control
