No — there are no ongoing monitoring fees required to use Mercari lone worker alarms. You buy the device outright and it sends emergency alerts directly to your nominated contacts (for example, a supervisor or manager), so you’re not locked into monthly monitoring contracts.
The only ongoing cost is a SIM/mobile plan for connectivity (depending on your setup and coverage needs). This gives you predictable total cost of ownership while still providing fast SOS alerts and location sharing when help is needed.