the same 12-megapixel rear-facing camera as the S7, with a "Dual Pixel" image sensor and f/1.7 aperture lens. Biometrics The Galaxy Note 7 also offers an iris recognition system, using a front-facing camera and infrared illumination. The iris scanner can be used for unlocking, and as authentication for other features of the device (such as Samsung Pay and Secure Folder). A fingerprint reader is also embedded in the home button. Accessories Optional accessories for the device are the S-View Standing Cover with a preview window through which basic device functionality is accessible while closed, and a water-resistant battery case which delivers power wirelessly through its Qi interface. Software The Galaxy Note 7 is supplied with Android 6.0.1 "Marshmallow" and an updated version of Samsung's proprietary TouchWiz user interface and software suite codenamed "Project Grace". It features an "always-on display" mode, which can display a clock and notifications on-screen when the device is not in use; different clock styles and support for notifications from third-party apps were added for the "Grace" version. The Screen off memo feature also leverages this mode, allowing users to write notes on the always-on display. The OS also features several new tools supporting the S Pen stylus, including translation, a screen magnifier, and a GIF recording tool. The previous suite of note-taking apps were also consolidated into a single Samsung Notes app. The Galaxy Note 7 introduces a security feature known as "Secure Folder"; it allows users to create a private workspace, protected by an authentication method, with separate user data and apps that are sandboxed from the main system. Installed apps can be cloned into Secure Folder, and users can designate whether notifications generated by apps in the Secure Folder are displayed from outside it. Secure Folder is based on the Samsung Knox 2.7 technology, which also added the ability for enterprises to control the distribution of system updates, and improvements to mobile device management and Microsoft Exchange Server integration. The device also introduces Samsung Pass, a platform allowing apps to provide biometric authentication using its iris scanner. Samsung reached partnerships with several major U.S. banks to explore the integration of Samsung Pass into their mobile apps. Release Pre-orders for the Galaxy Note 7 opened the day after its unveiling, with a release in the United States on 19 August 2016. Samsung skipped the numbering of the Galaxy Note series directly from "5" to "7"