16 Outdoor Gadgets that Work

Mini Megaphone

Your brother-in-law's swim shorts may be loud, but you'll have him beat with this gadget to get the kids in for lunch, out of the pool, or packing up the campsite in a hurry. It may seem a little over-the-top, until you realize your previously futile attempts at getting them within earshot have been addressed with one try of the megaphone.