A lone worker device is a purpose-built safety alarm used by people who work alone or away from immediate help. If an incident happens, the worker can press an SOS button to send an emergency alert to nominated contacts, often including GPS location to speed up response. Many lone worker devices also include man-down / no-motion or fall detection, which can trigger an automatic alert if the worker becomes incapacitated. Unlike a smartphone app, a dedicated Mercari Technologies lone worker device is designed to be simple, reliable, and easy to activate under stress—helping organisations protect staff and strengthen lone worker safety procedures.