The back is textured with a ribbed rubber coating that lends an extra sense of durability (though the handset is not a rugged phone). The back plate is secured by a small toggle lock to ensure that water does not seep in.
Kyocera reports that you can submerge the Hydro Plus in up to a meter of water for 30 minutes. I stuck it under running water several times, and finally dropped the handset into a tall vase after making sure all the ports were appropriately sealed. Through all these trials, the phone survived.
The 3.5-inch HVGA IPS screen has a 480x320-pixel resolution. The display has a narrow viewing angle, especially when seen in direct sunlight, and it appeared washed out when slightly tilted at any angle.
The Hydro Plus runs on Android 4.0.4 Ice Cream Sandwich, which is a really dated OS version even for entry-level devices. You'll still get your standard lineup of Google apps, however, such as Chrome, Gmail, and Plus.