Power key: use this key to turn on or off your phone, turn on or off the screen, launch the camera, etc.Volume key: use this key to adjust the volume, take a picture, zoom in or out in some apps, etc.Iris scanner: when you set iris as your screen lock type, this scanner will be used to scan your iris to unlock the screen.This camera is also used by the phone to make some features work, as the example, it'll detect your face so that the screen will stay on while you're looking at it. 8MP Front camera: you can use this to take a self-portrait photos.Light/proximity sensor: this sensor is used by the phone to make some features work when it's blocked by an object, as the example, the screen will auto turn off when this sensor is blocked by your face or ear during calls, the screen will auto turn on when you move your hand above this sensor, etc.Iris detection LED: it will light up when your phone recognises your iris.LED indicator: it will light up when the screen is off to show statuses of sound recording, unread notifications, and battery. Microphone (at the top side of the phone).SIM card tray(at the top side of the phone): this tray has two holes that you can use to place two SIM cards if you want to use dual SIM mode or to place a SIM card and an SD card if you want to use single SIM mode.
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