How an Emergency Alert System Works From Press to Response

Step 1: the trigger

An alert starts in one of three ways.

• A deliberate press of a pendant, wristband or wall button by the person.
• Automatic detection, such as a fall detector that senses a sudden movement followed by stillness, or a sensor that notices no movement for a long time; see fall detection watch guide and door sensor guide.
• A remote trigger, such as a family member calling the device or a smoke or gas detector linked to the system.

Where it fails: the pendant is not worn, the person cannot reach it, the button is too stiff, the person is unconscious and the device has no automatic detection, or the fall detector misses the fall. Strengthen it: choose an easy, comfortable device, add automatic detection if suitable, fix extra buttons in the bathroom and bedroom, and practise; see panic pendant buying guide.

Step 2: the signal travels

The trigger sends a radio signal.

• To a base unit in the home, a box plugged into power with a speaker and microphone. The range is typically limited to the home and affected by walls, floors and metal.
• Directly to the mobile network through a built-in SIM, as in many mobile pendants and watches, which may also report location by satellite positioning and mobile towers.
• To a smartphone through Bluetooth, which then uses data or calls.

Where it fails: out of range, thick walls, a dead battery in the pendant, no mobile signal inside the lift or flat, a phone that is switched off or far away. Strengthen it: test the range in every room, use a range extender, choose a SIM-based device for people who go out, and check batteries; see safety device batteries and checks.

Step 3: the connection to the outside world

The base unit or device must reach someone through a communication channel: a landline, a mobile SIM, home broadband or an app on the internet.

Where it fails: a power cut that switches off the router and base, a landline that is out of order, a SIM with no credit or data, a weak signal, internet down. In India, power and connectivity interruptions are common; see power cuts and older adults. Strengthen it: choose a device with battery backup, use a SIM-based unit as primary or backup, put the router on a small backup power supply, and check with the supplier what happens when links fail.

Step 4: who receives the alert

Two main models exist.

Family-and-friends call list. The device calls or messages a set list of numbers in order. If the first does not answer, it tries the next, and may repeat the loop. The first person to answer typically hears the person on the speaker, or an automatic message, and decides what to do.

Monitoring centre. A staffed centre (sometimes 24 hours) receives the alert, tries to speak with the person through the base unit, then calls the contacts in order and, if needed, emergency services. The centre usually holds information such as the person's name, address, medical conditions and key-holder details. Services vary in staffing, languages and response; ask exactly what is offered.

Where it fails: the first contact is busy, asleep, in a meeting, has a silent phone or is far away; the list has only one number; the number has changed; the centre cannot understand the language; staff cannot find the address. Strengthen it: name at least three contacts, with different routines and locations, keep the list up to date, give contacts a clear role, and make sure the address is precise, with landmarks and floor; see responding to an alert: who does what.

Step 5: assessing the situation

The responder, whether a family member or a centre operator, tries to find out what has happened.

• They may speak through the base unit and ask: Are you hurt? Can you move? Do you need an ambulance?
• If the person cannot answer, or the alert came from automatic detection, they usually treat it as serious.
• They may check location if the device has it.
• They may call the person's phone or a neighbour.

Where it fails: the person is confused, hard of hearing, in pain or too far from the base to hear; the responder does not know the person's medical history; the responder assumes a false alarm. Strengthen it: keep a short medical summary available to responders; see emergency contact card and medical summary. Treat every alert as real until proven otherwise. For hearing problems, see signs of hearing loss in parents.

Step 6: deciding what help is needed

Options include:

• Emergency services: call 112, India's emergency number, for ambulance, police or fire. Some states also use separate ambulance numbers, such as 108; see ambulance and emergency numbers in India.
• A nearby person: a neighbour, security guard, relative or friend who can reach the home in minutes.
• A doctor or nurse on a teleconsultation, for non-emergency questions; see teleconsultation and home readings.
• Reassurance and monitoring, for a minor event.

The responder should not wait if there are signs of a serious emergency: chest pain, breathlessness, unconsciousness, stroke signs, severe bleeding or a head injury. See what to do after a fall and stroke warning signs and first hour.

Where it fails: hesitation, fear of "overreacting", disagreements among family members, no clear authority to call an ambulance. Strengthen it: agree in advance that anyone who receives an alert may call 112 without waiting for consensus.

Step 7: reaching the home and getting in

Even a perfect call is useless if responders cannot get through the door.

• Entry for responders: a key safe with a code shared with trusted people, a spare key with a neighbour or security guard, or a doorbell and unlock arrangement.
• Gated societies and apartments: the gate, lift and security desk can delay ambulance crews. Tell the security team in advance, and agree a route; see safety in gated societies and apartments.
• Doors and locks: a door that is bolted from inside, a chain or a lock that a fallen person cannot open; see lock and door safety for seniors.
• Address and access details: clear directions for ambulance crews, landmarks, floor number and gate code.
• Time of travel: traffic, distance and night-time conditions affect arrival.

Where it fails: nobody has a key, the door is locked from inside, security staff do not allow entry, the ambulance cannot find the address. Strengthen it: plan entry before you need it.

Step 8: care at the scene and afterwards

Once help arrives, the focus shifts to treatment and follow-up.

• Paramedics or family assess the person. A medical summary and a list of medicines speed this; see emergency contact card and medical summary.
• If the person is taken to hospital, someone should go along with the pendant, phone, medicines and papers; see emergency bag for a hospital visit.
• After a fall or event, review what happened: why, what the system did, what went wrong. See what to do after a fall and falls risk assessment at home.
• Check the equipment and reset it.
• Offer reassurance and discuss changes, including medical review.

Other alert devices in the chain

An alert system is often more than a pendant.

• Door sensors notify carers when a door opens at night; see door sensor guide and wandering and dementia safety.
• GPS trackers report location; see GPS trackers for seniors.
• Smoke, gas and water detectors that send alerts; see smoke and gas safety for older adults.
• Bed or chair sensors and motion sensors for night safety; see night safety for a parent alone.
• Auto-off kettles and stove guards reduce risk; see auto-off kettle and stove safety.

Each device adds its own steps to the chain, and its own failure points.

Testing the chain

The only way to know your system works is to test it, end to end, regularly.

1. Tell everyone on the list that you are testing. 2. Press the button from different rooms, with the door closed. 3. Check that the call or message arrives, that the person answering can hear, and how long it took. 4. Test in a power cut by switching off the mains, if safe. 5. Test the key-holder route: can someone actually get in? 6. Time the response of a neighbour or family member. 7. Note faults and fix them. 8. Repeat monthly.

Privacy, consent and trust

Alerts involve personal information: address, health, movements and sometimes voice or location. Tell your parent what is collected, who sees it and why. Obtain their consent where they can give it. Choose services with clear data policies, and avoid sharing more than needed. A system that people trust is a system that will be worn; see privacy and dignity with monitoring.

When to ask a professional

Ask a doctor or occupational therapist about falls, dizziness, memory or movement problems that affect the use of a device, and about whether additional equipment would help. Ask your supplier to explain the chain in writing. For advice on services for older people, contact Elderline 14567 or local senior citizen organisations. In an emergency, call 112.