Personal Emergency Response Systems (PERS) are devices that allow you to signal for help at the push of a button. Based on your circumstances, the button could signal a variety of different things, but most commonly a medical emergency. In the event of a button being pushed, the following will normally occur.
The buttons can take several forms depending on personal preference. Often they are pendants, but can also be belt clips of bracelets. Additionally, sometimes they are mounted on bathroom walls in case of a slip.