The iPhone's sleep/wake button, volume buttons, vibrate switch and headset jack are all attached to the case's back panel. The panel also contains a small window for the camera and a grounding plate.
The large silver circle is the underside of the panel's Apple logo. The small black circle in the top right-hand corner of the back panel is the camera window.
The sleep/wake button, SIM card slot, headset jack, volume buttons and vibrate switch are all connected to the main printed circuit boards with the single ribbon cable.
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