The hull comes in one piece, yet divided into two parts: the back cover that hides the battery, and the flap microfiber to protect the screen. The back shell, while fulfilling the same functions as the original shell (NFC + Wireless charging), is not exactly the same. Indeed, it seems to be more robust. Slightly thicker, it protects a little loptique picture. Also the loudspeaker grille is found slightly reduced. Inscription "Nokia" disappears and will pop up only on the flap. The flap comes protect the screen however does not seem effective in a pocket or bag. Indeed, it does not saimante or sucker Little chance that in case of a fall, it remains closed obediently on the screen. We would have liked when lon takes a picture, the flap is cut at the device picture. For if we take a picture The flap locks the goal
in conclusion
1) if dropped no real protection because the flap which is supposed to protect the screen is therefore bound by any flap 9 out of 10 chance that the smartphone falls directly on the screen
2) the back in case of shock and totally eclipse separates from the smartphone which due to its battery back outside his smartphone
3) corners and buttons is no protection in case of fall already seen several times impact on smartphone corner causing screen cracks and protects in any way the aluminum perimeter of 830
4) article which is expensive for a dubious protection I absolutely recommend this purchase
the two points of it positive -1) Is that we need to remove the protection for charging by induction -2) Is that this article is sold in the color of your 830