A dead man's switch is one of the most important safety measures for security guards who work alone. It detects when the wearer becomes incapacitated and triggers an alarm automatically, without any action required from the person in danger. What started as a mechanical lever in locomotives and industrial machinery has gone digital: modern lone worker apps like COREDINATE run on the duty phone and replace dedicated hardware entirely.
Quick summary: A dead man's switch triggers an automatic alarm when a security guard stops responding. Smartphone-based lone worker apps like COREDINATE replace standalone hardware at a fraction of the cost, with the same alarm reliability.
A dead man's switch is a safety mechanism that triggers an alarm when the person wearing it fails to respond to regular check-in prompts. In the security industry, it protects guards who work alone during night shifts, building patrols, or mobile rounds by automatically calling for help if the guard becomes unconscious, falls, or is attacked.
The name comes from railways, where locomotive drivers had to keep a lever pressed at all times. If they let go, the train would brake automatically. In modern security work, the same principle runs digitally: the system checks at regular intervals whether the guard is still active, and if there is no response, it raises the alarm.
This is what separates a dead man's switch from a manual panic button. A panic button requires the guard to actively press it, which is useless if they are unconscious after a fall or a cardiac event. The dead man's switch covers exactly the scenario where a person can no longer call for help on their own.
In occupational safety terms, the dead man's switch falls under lone worker protection, which covers all measures designed to safeguard employees who work without visual or voice contact with colleagues. In security work, this applies to night shifts in empty buildings, guard patrols across large industrial sites, and solo mobile rounds.
Many people assume that a dead man's switch detects movement or vibrations through the phone's sensors. In practice, motion-based detection on smartphones is technically unreliable because normal stillness during a break and actual incapacitation produce nearly identical sensor readings. Professional lone worker devices therefore use a timer-based approach: the system actively prompts the guard to confirm they are okay at regular intervals, rather than trying to interpret passive sensor data.
Here is how the sequence works with COREDINATE's lone worker protection feature:
The check-in interval is configured in the COREDINATE portal and can be adjusted per site or risk level, shorter intervals for high-risk lone work in underground parking garages, longer ones for staffed reception areas. The automatic voice call requires a SIM card with an active cellular connection.
There is also an optional function test before shift start: the guard triggers a test alarm that the receiving center must acknowledge before the app unlocks the shift. This confirms that the entire alarm chain, from the smartphone through the cellular network to the control center, is working before the guard goes out alone.
Not every lone worker app on the market is actually certified to a recognized safety standard. COREDINATE has been independently tested and certified for alarm reliability, transmission speed to the receiving center, and false-alarm prevention. That matters when you are bidding on contracts where enterprise clients ask for documented proof that your lone worker protection system meets a professional standard.
For the full certified setup, COREDINATE pairs with a Crosscall smartphone (CORE M6, X5, or M5). The Crosscall hardware button doubles as a physical emergency trigger that the guard can reach inside a jacket pocket without unlocking the device.
A lone worker alarm is relevant wherever security guards work alone and out of sight of colleagues. In practice, the most common scenarios are:
Traditional lone worker devices are dedicated hardware: a separate gadget alongside the duty phone that needs to be charged, maintained, and carried. In practice, this often fails because of poor adoption. A second device gets forgotten in a locker, left on a charger, or simply not carried because it is one more thing to keep track of. The problem with that is straightforward: if the lone worker device is not on the guard's person, there is no lone worker protection, regardless of whether the company purchased one.
Smartphone-based lone worker apps solve this adoption problem by putting the dead man's switch on the device the guard already carries. With COREDINATE, the lone worker protection runs on the same phone the guard uses to scan checkpoints, log incidents, and complete patrol rounds. One device for everything means there is no device left behind.
| Criteria | Smartphone app (COREDINATE) | Standalone device |
|---|---|---|
| Additional hardware | None, runs on the duty phone | Yes, separate device required |
| Certified alarm reliability | Yes, with Crosscall smartphone | Varies by manufacturer |
| Context data on alarm | GPS + checkpoint history + shift info | GPS only |
| Team adoption | High (no additional device to carry) | Low (frequently forgotten or left behind) |
| Integration with guard tour system | Full | None |
| Cost | From $34/month including man down alarm | $550-1,650 upfront + maintenance |
In addition to the automatic man down alarm, COREDINATE also provides a manual emergency button, accessible through the Crosscall hardware key or directly within the app. Both alarm types live in a single application: automatic protection when the guard is incapacitated, manual alarm when there is an active threat or acute emergency.
There is a practical advantage that standalone lone worker devices cannot match. When an alarm fires, the portal immediately shows the guard's GPS position, their most recently scanned checkpoints, and their current shift assignment. The operations center knows not just that something happened, but where in the building the guard was and what shift context they were working in. A standalone device sends a location ping and nothing else.
"With the dead man's switch, the colleague on the ground feels safe too, because I don't just know their location but their condition in case of an accident. It's peace of mind for both sides. That's what responsible employee management looks like."
Volker Frisse — Protection One GmbH
The man down alarm is included in both COREDINATE packages at no extra charge:
Crosscall smartphone bundles are available from the COREDINATE Shop.
The terms describe the same function from different angles. "Dead man's switch" comes from the original industrial application where a physical switch had to be held down, while "man down alarm" describes what happens when the system detects that a person is no longer responsive. In the security industry, both terms are common, along with "lone worker alarm" and "inactivity alarm."
Yes. The alarm is triggered on the smartphone itself, independent of the internet connection. The local siren sounds regardless of connectivity, and the automatic emergency call goes through the cellular voice network, not through data. GPS coordinates and checkpoint scan history sync to the COREDINATE portal as soon as a data connection is available again.
Yes. The interval between check-in prompts is configured in the COREDINATE portal and can be set per site or risk level. Higher-risk lone worker assignments like underground parking garages or remote industrial compounds warrant shorter intervals, while staffed reception areas can use longer ones.
The COREDINATE app runs on Android and iOS. The lone worker protection feature (dead man's switch) is currently available on Android devices only. For a dedicated physical emergency button that works from inside a jacket pocket without unlocking the screen, pair it with a Crosscall smartphone (e.g. CORE M6).
There is no blanket legal requirement for a dead man's switch in most jurisdictions. However, occupational safety regulations generally require employers to conduct risk assessments and provide appropriate safety measures for lone workers. When that risk assessment identifies elevated danger, such as solo night patrols in empty buildings or on remote industrial sites, a lone worker alarm system is the standard way to meet that obligation. Check your local occupational safety authority for the specific requirements in your region.
Standalone lone worker devices typically cost between $550 and $1,650 upfront, plus ongoing maintenance fees. Smartphone-based solutions like COREDINATE start at EUR 32 per month per device, with the man down alarm included at no additional cost.
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