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Capacitive touch screen phones are very sensitive on the water surface when they are equipped with this waterproof bag. However, under water, they are affected by water pressure, which makes them relatively slow. In most cases, the touch screen of the phone becomes virtually useless underwater, not because of the problem with the bag but because of the issues with the capacitive touch screen of the phone and the natural environment.
The reason why underwater operations are not possible is because the surface of the capacitive screen has a layer of conductive material. When a finger touches the screen, it absorbs a portion of the electricity, causing the electric field to change and allowing for touch operations. Since water is a conductor, if the screen comes into contact with water, it may not be able to detect the position of the finger, leading to touch malfunctions.
This is about mobile phones, for example, the Moto Me525, a waterproof phone. It can be submerged in water without any problems, but the touch screen is a capacitive screen, and water is a conductor, which can lead to the capacitive screen failing. If it were a resistive screen, there would be no such problem, and it could still be used underwater.
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