This product is ideal for both younger and elderly people who are looking for a safety device that can be carried anywhere with ease. Since the alarms are on a key chain, they can be placed in a purse, pocket or jacket where they stay within easy reach when you need them. Each unit also comes with a built in light, to help you see in the dark. So don’t needlessly put your safety at risk when an inexpensive and easy to use device like this could make all the difference.