https://www.loneworkeralarms.co.nz/man-down-alarm/
Lone working devices (or personal alarm panic buttons) are essential tools for those working alone in remote locations, on construction sites or any other workplaces that lack mobile coverage. These solutions ensure a call for help is always heard by anyone nearby; and as an added benefit can alert both colleagues and emergency services should there be any risks that require assistance. There are various lone working device options on the market. From standalone, SIM-enabled lone working devices with built-in two-way communication and