Why are there additional circular holes at some places?
These small circular cuts are necessary to expose important sensors that the device relies on for functionality.
For example, on a mobile phone, there will be holes next to the speaker to expose the front camera, proximity sensor and ambient light sensor.
Remember to remove these cutouts before applying the Skin. When peeling the Skin off the backing card, most of these cutout should come off but if they're still stuck on, they can be poked out with a pin.