What’s something that you wanted as a kid, but never got to have? The list might be long, and the reasons are many: it didn’t exist; your parents wouldn’t allow it; you didn’t have enough cash; and so on and so forth.
Whistles can come in handy during emergencies and natural disasters. They’re especially useful in catching the attention of rescuers who might not be able to see survivors clearly because of the conditions. Unfortunately, not everyone walks around carrying a whistle in their pocket or wearing one around their neck.
People have come up with iPhone cases that come attached with all sorts of stuff, like extra battery packs, card holders, and even bottle openers. Those seem like reasonable things to have integrated onto a phone case.