Some features of an iPhone, such as the iPhone 6 and iPhone 6s models, include 3D Touch, which allows the display to detect the force behind a tap and provide tactile feedback in real time using subtle vibrations, and a 12-megapixel iSight camera capable of capturing video in 4K resolution. Other features include the 64-bit A9 chip that provides improved processing power relative to older models and the Touch ID function that operates as a fingerprint sensor.
Compared to previous iterations, the latest iPhone models as of 2016 offer almost double the performance when using LTE and Wi-Fi. IPhone 6s supports up to 23 LTE bands and is capable of connecting to external devices, including speakers and the Apple Watch, using Bluetooth technology. For system operations, the latest models use iOS 9, an operating system that includes built-in apps, improved Siri functionality and access to additional apps via the Apple Store.
In addition to standard multi-touch gestures such as swiping and pinching, 3D Touch features peek and pop functionality, allowing users to preview content by tapping on it lightly and open it by applying more pressure behind the tap. This gesture works when previewing email messages, photos, map locations and website content. The Live Photos feature provides an option to capture several moments before and after taking a picture, which lets users set the picture in motion by using appropriate gestures. In addition to the main camera, it also includes a FaceTime HD camera.