How to choose a lone-worker safety device

The cheapest lone-worker alarm is software on a phone the worker already carries. If the job allows a phone, the phone stays charged, and it is genuinely reachable — in a hand or a front pocket, not a bag — an app with an SOS trigger and live location covers a lot of roles: community staff driving between visits, agents meeting clients alone, anyone whose work happens around their phone.

The failures are just as concrete. Production floors that prohibit personal phones. Gloves that cannot work a touchscreen. A phone in a locker two floors down, or in a coat on the far side of the room, or flat at hour ten of a twelve-hour shift. An app cannot raise an alarm from a locker, and no amount of software fixes that. If any of those describe the role, keep reading.

The Bluetooth button solves one specific, very common gap: the phone is present, but not in the worker’s hand. The button rides on a keyring, a lanyard or a waistband, and the phone stays in a pocket or bag and does the alerting. ProTechMe’s BLE button triggers on two firm presses by default — the gesture is configurable in the app — and works up to 50 m from the paired phone.

It is built to be forgotten until needed: 8 g, water-repellent, running on a replaceable CR2032 coin cell for up to three years, so there is no charging routine to police. A front LED shows green when connected and yellow when not — a one-glance daily check.

The honest limit: a Bluetooth panic button is a remote trigger for the phone. If the phone is off, flat or left in the car, the presses go nowhere. It is the right class where phones are allowed but hands are busy, and the wrong one where phones are banned.

The third class removes the phone from the equation entirely. A standalone GPS alarm has its own SIM and its own 4G connection, so it needs no pairing and no phone on the worker at all. On ProTechMe’s GPS button, an alarm is raised by holding the SOS key for five seconds, or automatically when the device detects a fall — the case where the worker never gets to press anything.

Because there is no phone in the loop, the device carries the conversation too: two-way, full-duplex voice, so the worker can speak and be spoken to through the alarm itself. Position is GPS, accurate to about three metres outdoors. The device is IP67-rated, runs 96 hours on standby, and takes updates over the air — which matters for hardware that will live in the field for years.

This is the class for no-phone environments: restricted production floors, night shifts, remote field work, any role where “they’ll have their phone” is a hope rather than a fact. It costs more, and connectivity for this class is normally quoted per deployment rather than off a price card.

There is a middle case the three classes miss: workers who cannot carry phones but spend their whole shift inside one building — a care home, a clinic, a production hall. For that, a site receiver picks up the Bluetooth buttons’ signal directly, so an alarm gets out with no phone anywhere nearby. Ours is called the Hub, and it can also run as a backup receiver alongside phones.

The practical effect is that a coin-cell button, which on its own must stay near a paired phone, becomes usable across a building. Ask any vendor offering this how many receivers your actual site needs — the honest answer depends on your walls and floors, not on brochure figures.

If the phone is reliably present, charged and allowed, buy Bluetooth. The buttons are cheaper and lighter, and they run for years on a coin cell, so the fleet stays alive without a charging rota. If the phone is not guaranteed — by policy, by gloves, by lockers, by the reality of the job — buy GPS: own connection, own position, own voice.

Most organisations of any size end up with a mix, and that is the correct outcome, not a compromise. Buying one class for every role is how deployments fail: the office staff get hardware they never needed, and the night shift gets an app they cannot reach.

Whichever class fits, the device is the smallest part of what you are buying. The alarm chain around it decides whether help actually arrives. Five questions separate a serious vendor from a spec sheet:

After all of this, the deciding factor is dull: a personal alarm for employees only earns its keep while it is worn, and the best lone-worker safety device is the one your team actually wears and actually charges. An 8 g button that lives on the keys beats a more capable device that lives in a drawer.

So trial before you buy — real shifts, real gloves, real lockers — and ask the workers, not the safety committee, which device they would still be wearing in month six. Then put the classes side by side against each role, and buy the mix the answers point to.