The new iPhone 8, iPhone X and iPhone 8S are displayed during an Apple special event at the Steve Jobs Theatre on the Apple Park campus in Cupertino, California. Pic/AFP

Apple has finally unveiled three new iPhones, as well as upgrades for the Apple Watch, Apple TV and Airpod wireless headphones on Tuesday. Apple launched three iPhones including iPhone X, iPhone 8 and iPhone 8 Plus at an event on Apple's new campus, at the Steve Jobs Theater. Here are the key features of the three iPhones launched in California.