A basic shell silicone gel that is perfectly adjusted to the phone seems solid. One can regret an additional hole at the back which obviously useless? Like all nuts, attention to the jack (if you have big enough jack tips they do not enfonceront enough).
If the other ports remain accessible, as the infrared port, jack, USB and the loudspeakers. For even 1 without pdfs, and received very quickly, do not hesitate! P