Does it work without a smartphone?

Yes. Mercari lone worker alarms are dedicated safety devices, so they can work without a smartphone. The worker carries or wears the device and can trigger an emergency alert with a one-press SOS button (and, if enabled, automatic alerts like man-down/no-motion or fall detection). Alerts are sent directly to your nominated contacts, often with GPS location to speed up response. Because it doesn’t rely on a phone app, it avoids common issues like app crashes, notification settings, or a flat phone battery—making it a more dependable option for lone worker safety.