My grandmother is getting pretty old and is using a device around here wrist as protection if she were to fall or hurt herself. It is safer for her and the rest of the family feels a bit better about her living alone at her house. But this device will not help if she falls and can not push the button.
There are some other alternatives to the device my grandmother is using. One is a Medical Alert device that has a built in fall alert that goes off if the person falls down. It is being sold by a company called BrickHouse Alert that makes systems that can protect you 24/7.
Another Medical Alert device that this company sells is a GPS tracking bracelet that can be helpful with demented people. It got a built in “wander alert” that let you know by mobile phone or email if a person is wandering off. The device also got a speaker system that let both parties talk with each other. If there is an emergency you will know immediately where the person wearing the GPS device is located.
One should be a bit careful with a GPS device like this and not use it to track people. That would hurt their privacy and is probably illegal.