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Lone Worker Devices Lone Worker Safety Device


Your lone worker device should only be used for calling support or help if you are threatened, at risk or being assaulted or if you have had an accident.

When the SOS button is pressed it sends your location & starts calling up to 10 people (It can call emergency services). The device includes an integrated fall detection feature as well as powerful speakerphone & microphone within the device for hands free speak phone communications.

Your lone worker device has a ‘pre-alarm function’  or Non-Emergency side button that voice calls a single nominated contact if you are entering an area where you do not feel safe of if you are getting concerned about the situation you are involved in.  The operation of the pre-alarm will allow the user to advise that you wish them to listen in but take no action or that you have entered an area you are unsure of. The pre-alarm function is for your safety and to aid you in your lone working. You can use this as part of your risk assessment (in accordance with your company emergency Health and safety policies)

You should not use your lone worker device in situations where there is no threat to yourself. Your company health and safety policy and procedures will give you guidance on actions to take in non emergency or low threat situations. You may for example be required to call directly to the relevant agency or first responder (police, fire, ambulance, supervisor, manager, first aider, etc).

Protect your lone worker device from accidental misuse which may occur when unfamiliar users are not trained correctly. Accidental misuse can cause false alarm calls to the police, responding agencies, or nominated contacts.

The care and use of your lone worker device is very important for your safety and you should fully understand the lone worker procedures and lone worker policies your employer has put in place to support you in a lone worker environment. There are certain steps to take to ensure your lone worker device is in good working order.

  1. Ensure your device battery is fully charged before starting your shift and that you have a charging cable with you if you are away from your normal charging point for extended periods of time.
  2. When entering unfamiliar lone worker areas, ensure that you check the cellular signal strength of your lone worker device by calling or texting the device. If it responds, there is adequate signal.
  3. Ensure you protect your lone worker device from the environment. The device should not be immersed in water, subjected to crushing, extreme temperatures, shocks or electrical overloads.
  4. Ensure you are trained on the functions on your lone worker device and how they work so that if you need to operate your lone worker device in an emergency you know how it operates.
  5. Depending on your situation you may need to place your lone worker device in a position that you can operate it easily and discreetly if required. Consider your ability to reach or use the safety device before your start your lone working duties.
  6. Remember to clean down your device on a regular basis using a damp cloth. Do not use any chemical to clean the device.

How the lone worker device works

Activating SOS

Press the SOS button and the device will text first and then can begin to call your 10 nominated contacts in your chosen order. The device will first send a ‘help me’ text message to each person where the nominated contact number is a cell phone. The device can be programmed to have no calls and send text message alerts only (Recommended).  If calls are initiated, the device has integrated hands free communication through the in-built microphone and speaker. The user talks and listens hands free through the device.

A lone worker device sends GPS location to 10 emergency contacts

All of the ‘help me’ text messages contain a link to Google Maps hyperlink with the device location via the inbuilt GPS. In absence of GPS (Indoors) the device will automatically fall back to wifi & cell tower (GSM) location finding.

Set emergency services as a contact

You can set emergency services such as 911 as a contact for calls.

Side talk button – Pre-alarm emergency voice call to a nominated contact

At any time the wearer can press the side talk button and make a pre-alarm call to a nominated contact using the speakerphone. This button does not initiate any emergency or send any text messages, it simply makes a voice call to a pre-selected contact.

Welfare – anytime voice calling to the device

Any person knowing the device phone number can call the mobile phone number of the device and talk to the user through the in-built speaker and microphone. The device answers automatically after two rings. The user does not need to press any buttons to answer incoming calls.


Check the location of the lone worker device anytime

Query the device for its location by simply sending it a coded text message and you will receive a response text showing the wearer’s location on your phones Google Maps

Change your nominated Emergency contacts anytime

The device contacts can be changed simply by sending coded text messages to the device mobile phone number.

Fall detection

The device has integrated automatic fall detection. When a fall is detected, it will announce “Fall has been detected. Click the SOS button to stop”. It will repeat this warning 3 times before sending text messages and making the SOS-help call. You can click the SOS button during the 3 announcements to cancel the alarm sequence

Man down No-motion sensor

The device is equipped with sensors that can detect motion or no-motion. If the device senses no-motion for a customizable period of time, the device automatically sends an alert to emergency contacts that no-motion has been detected and a man down situation is possibly at hand.

Wear it in the shower or rain

The lone worker device can be worn in the shower or the rain.

Program the lone worker device by sending it text messages

Programming and to change settings, turn features on and off is done by sending simple coded text messages to the mobile phone number of the device.

Cellular coverage

The Mercari device requires a SIM card to communicate. It is the user responsibility to provide a compatible SIM card with credit, voice, SMS and data capability. The device requires the coverage of a compatible cellular carriers transmission frequency. Verification that the Alarm Pendant is in cellular coverage can be verified by the Green LED light flashing rapidly once in 3 second intervals

The device is specifically designed for people who are likely to suffer medical events, hostile environments, falls or other workplace safety situations.