What Is a PERS Device? Personal Emergency Response Systems Explained

PERS is the industry abbreviation for Personal Emergency Response System. In everyday language it is a medical alert, a personal alarm, a panic button or a lifeline. All of those refer to the same underlying product: a device carrying a help button that a person can press to summon assistance without reaching a telephone.

A complete PERS has up to four parts, and cheaper products simply omit some of them:

• The wearable. A pendant on a lanyard, a wristband, or a clip. This is the part that has to be on the body at the moment it matters, which is also the part of the design that fails most often in real households.
• The communicator. Either a base station in the home that connects over a landline, broadband or cellular, or a cellular radio built into the wearable itself.
• The answering service. In a monitored system, a staffed centre that receives the alert and speaks to the person, usually through a speaker in the base station or the device.
• The response. What the service actually does — call a named contact, send a mobile responder, or dispatch emergency services.

The word "system" is doing real work in that name. What you are buying is not principally a button; it is an arrangement for what happens after the button. Two products with identical hardware can behave completely differently at 3am, and the difference is in parts three and four.

Step by step, because this sequence is rarely spelled out and it is where the useful questions live.

1. The button is pressed. On a monitored device this opens a connection to the provider's call centre, not to emergency services.
2. An operator answers and speaks to the person, through the base station speaker if it is an in-home unit or through the device if it is mobile. Response times vary between providers and are a fair question to ask before signing.
3. The operator assesses. If the person can talk, the operator establishes what has happened. If nobody responds, the operator treats it as an unknown emergency, which is the scenario that matters most.
4. The operator acts on the plan you gave them. This is the part families do not realise they control. When you set up the account you supply a response list: which neighbour or relative to call first, whether to send an ambulance immediately or only if there is no answer, whether there is a key safe and what the code is.
5. Follow-up. Better services call back to confirm someone arrived.

Three implications. First, the quality of your response list matters more than the quality of the device — a state-of-the-art pendant with an out-of-date phone number on the account is a slow system. Second, the operator needs a way into the property; a key safe is not a detail, it is the difference between a neighbour helping in four minutes and a fire service forcing a door in forty. Third, if nobody answers the speaker the service is working blind, so ask specifically what the provider does in that case.

This is the first structural fork in the category, and it determines the entire cost profile.

A monitored PERS connects to a staffed centre available around the clock. You pay a recurring fee for as long as the person has it. What the fee buys is a trained human who answers within seconds, can hear the person, can assess, and can escalate — including when the person cannot speak. For someone living alone with no nearby family, that is the strongest argument in this whole market.

An unmonitored PERS has no service behind it. Pressing the button either sounds a loud local siren or auto-dials a list of numbers you programmed, playing a recorded message. There is no monthly fee, which is why it appears in searches for free or cheap alarms.

The honest comparison is not "monitored is better". It is that they fail differently. Unmonitored devices fail when your list does not answer — no operator notices that nobody picked up, so the alert simply evaporates. Monitored services fail when the fee lapses, when the response list is stale, or when the device is not being worn. If you choose unmonitored, the mitigation is a longer contact list and a periodic test call; if you choose monitored, the mitigation is reviewing the response list once a year.

Our page on alternatives to a personal emergency response system covers what to do when neither model fits.

The second structural fork, and the source of the most common expensive mistake in the market.

In-home systems pair the wearable with a base station. The pendant works only within radio range of that base — typically a few hundred feet, less through thick walls — and the two-way conversation happens through the base station's speaker. That last detail matters: a person who has fallen at the far end of the garden may successfully trigger the alarm and be unable to hear or be heard by the operator.

Mobile systems put a cellular radio and usually GPS into the wearable itself. They work anywhere with network coverage, and the conversation happens through the device. They cost more, need charging far more often, and depend on signal quality where the person actually is.

How to choose: buy for the person's real week, not their typical day. Someone who gardens, walks to the shops, attends a lunch club or drives will spend a meaningful part of their waking life outside base-station range, and an in-home unit protects only the hours they are already safest. Someone genuinely housebound, or with limited mobility, gets better battery life and lower cost from an in-home unit and loses nothing.

The compromise many households land on is an in-home unit plus a phone-based arrangement for the hours spent out of range.

This is the distinction people most often ask about, and the terms are used loosely, so here is what each usually means in practice.

A basic medical alert button does one thing: it sends a help signal when pressed. It has a long battery life, often measured in years for the pendant, no screen, no sensors, and nothing to learn. Its reliability comes from its simplicity — there is nothing to update, nothing to charge nightly, and nothing to misunderstand.

A smart medical alert device adds sensing and connectivity. Typically that means some combination of automatic fall detection, GPS location, a cellular connection independent of the home, a screen or voice interface, activity tracking, medication reminders, and a companion app for family. Smartwatch-format devices sit at this end of the range.

The trade-offs are consistent and worth stating plainly.

• Charging. Basic buttons run for a very long time on a sealed battery. Smart devices generally need charging daily or every few days — and the charging window is often overnight, which is when nocturnal falls happen. This is the most underrated failure mode in the whole category.
• Complexity versus adoption. Every additional feature is another thing that can be misconfigured, misunderstood, or resented. A device that is not worn has a 0% success rate regardless of specification.
• False alarms. Automatic sensing creates alerts that a button does not. Some false alarms are the price of automatic detection; too many of them train the household to ignore the device.
• Cost. Smart devices cost more upfront and usually more per month, and the extra sensing is frequently billed as an add-on rather than included.

A reasonable rule: buy the basic button if the concern is a conscious person needing help and the person is likely to be at home; buy the smart device if the concern includes losing consciousness, being out of the house, or not being able to press anything. Buy neither if the honest answer is that they will not wear it — in that case a passive system or a phone-based approach is the productive next step.

Automatic fall detection uses accelerometers to identify the signature of a fall and raise an alert without the button being pressed. It exists because the pendant's core assumption — a conscious person who can press — fails in exactly the emergencies that matter most.

Four things to know before paying for it.

It is usually a separate monthly charge. Not a hardware feature you buy once. On many plans it is an add-on line on the bill for as long as you have the service.

No fall detection catches every fall. Slow slides down a wall, falls onto a soft surface and falls from a seated position are all harder to detect than a sharp drop. Treat it as an additional layer, not a replacement for the button.

It generates false positives. Sitting down heavily, dropping the pendant, and some kinds of exercise can trigger it. A good system handles this by asking the wearer to confirm before escalating.

It only works when worn. This is the one that undoes everything else. Fall detection on a pendant hanging on a bedpost is a monthly charge for nothing.

Falls are the background risk under this entire product category: over 14 million adults aged 65 and over — around one in four — report falling each year in the United States, and falls are the leading cause of injury death in that age group (CDC, Facts About Falls). What makes a fall dangerous is often the time afterwards rather than the impact. In a prospective study of people in their nineties, 82% of falls happened when the person was alone, 80% of those who fell could not get up unaided, and 30% lay on the floor for an hour or more (Fleming & Brayne, BMJ 2008). Among people found helpless or dead at home, mortality was 67% for those down more than 72 hours against 12% for those found within an hour (Gurley et al., NEJM 1996). Every product on this page is, ultimately, an attempt to move a household from the first number towards the second.

PERS pricing is unusually opaque for a consumer product, and several large vendors do not publish it at all. What follows is limited to what companies state on their own sites, with the date checked.

Vendors that publish. Bay Alarm Medical listed SOS Home at $27.95/mo, SOS All-In-One 2 at $34.95/mo, SOS Micro at $34.95/mo and SOS Smartwatch at $39.95/mo on its own site when we checked in August 2026; fall detection is described as built-in on some products and an optional add-on on others, without a published add-on price. In the UK, Age UK Trading published a full list: Digital Personal Alarm £69.99 setup plus £22.49/month, Digital Fall Alarm £69.99 plus £28.49/month, Taking Care Anywhere £70 plus £31.49/month, Personal Alarm Watch £99.99 plus £24.49/month, Taking Care GO £79.99 plus £25.49/month — all ex VAT, checked August 2026, with Age UK stating that 94% of its personal alarm customers qualify for disability VAT relief and do not pay VAT.

Vendors that do not publish. When we checked in August 2026, Medical Guardian's own medical alert systems comparison page listed no prices, showed fall detection as an "Available Add-On", and directed buyers to call. Life Alert also published no price: its pricing URL returned a 404, and its cost page invited visitors to phone for a free quote. Decide your budget before that call.

The costs that are not the monthly fee. Activation or setup charges. Equipment that is leased rather than owned, and must be returned. Fall detection as a separate recurring line. Protection or damage-waiver plans. Shipping both ways. And the one that catches most people: cancellation terms — the notice period, whether prepaid months are refunded, whether the contract has a minimum term, and who pays return postage. Ask for all of that in writing before you order, and ask for the total over 36 months rather than the monthly figure. Our full cost breakdown works through the arithmetic.

A PERS is a good fit when the person lives alone, is likely to be conscious in an emergency, has a known medical risk such as a cardiac condition or a history of falls, has no one nearby who would notice quickly, and — critically — will actually wear the device. For that profile, a monitored PERS is the fastest route from incident to help that exists at a consumer price.

A PERS is a poor fit when the person has already refused to wear one, when the concern is cognitive rather than physical, when the risk is gradual decline rather than a sudden event, or when the household cannot sustain a recurring fee indefinitely. It is also a poor fit for wandering: an emergency button does not tell you the front door opened at midnight — see dementia wandering alarms for that problem.

Refusal deserves particular attention, because families read it as stubbornness and it usually is not. For many people the pendant is a public statement about their own decline, worn on the body, visible to visitors. When someone will not wear one, the productive response is not a more comfortable pendant; it is a category change — to a passive system that asks nothing, or a phone-based approach that does not look like medical equipment. The full taxonomy of monitoring systems sets out what those alternatives are.

We build the other thing, so it is worth being precise about the difference rather than blurring it.

I'm Alive is a daily check-in app. You confirm you're okay once a day; if you don't, the people you chose are told, with your location. The daily check-in is free (Try It, $0) and works on iPhone and Android anywhere in the world. Automatic alerts to your contacts start on Protect Me ($29.99/year), with location on the move on Protect Me On The Move ($39.99/year); there is a one-time Stay Connected lifetime upgrade at $4.99. Check-first phone fall detection is live on iPhone only (app v2.3.1) on Protect Me and above, stays off until you switch it on, and only runs while the app is open — it is not a background service. It alerts your own trusted contacts; it never calls emergency services, and it is best-effort, not a medical device. There is no Android fall detection and no Apple Watch fall detection. We do not operate a 24/7 monitoring centre. The app interface is currently in English only.

A PERS is reactive and fast: an emergency happens, a button is pressed or a fall is detected, and a trained operator responds in seconds. A daily check-in is proactive and slow: nothing needs to happen for it to work, and its job is to make sure that a bad situation is noticed within about a day rather than a week. The first shortens the response to an emergency; the second shortens the time before anyone knows there was one.

They are complements, not substitutes, and the pairing is common: a monitored pendant for the acute event, a check-in for the quiet failure that never triggers an alarm. What a check-in app does not do — and what we will not imply it does — is answer a button in seconds, speak to the person, or send an ambulance. We have no monitoring centre and never contact emergency services. If that specific capability is what the household needs, buy a monitored PERS.

Further reading: pendant alarm versus daily check-in and how we compare with medical alert buttons.