Numera Wall-mount Help Button (345 MHz) is a perfect accessory to complement your Numera PERS-4200X panel, Numera Libris mobile PERS system or 2GIG system. Help Button is designed to be installed and used in places where emergency calls often take place i.e. next to the bed, or in the bathroom. Help Button comes with two design options: blue shaded help button or alternate red help button. Expected range varies from 300 feet (with Libris), 500 feet (2GIG system) up to 1000 feet (with PERS-4200X) line of sight.