Sony's waterproof Xperia Z4 takes on premium tablets
 

Sony is the latest tablet maker with an uber-slender Android slate. The Xperia Z4 measures just 6.1 mm thick, allowing it to slip into the same dress size as Dell's Venue 8 7000 and Apple's iPad Air 2. It's a relative featherweight, too, at only 13.9 ounces (393 grams). And, unlike most tablets, it can be dunked under water for up to 30 minutes with no ill effects.

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