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Sony Xperia Z claims to be waterproof with IP57 rating. We'll make a test for cheking the "underwater" performance of the device.
Let's switch it on and make it awake showing a video.
Now, Xperia Z is completely underwater.
Still showing the video...
I'll pull it from the vase. Still working... The screen is quite responsive even wet. Waterprotection seems to be valuable feature of high end smartphones. Definatelly a key advantage when you are considering the purchase of such gadget.