Will two monitors interfere with each other?

A DECT audio set uses the European cordless-phone band; a Wi-Fi camera uses your 2.4 or 5 GHz network. They are not the same radio. They can still annoy you if both speakers are on, or if talk-back from one is picked up as a 'cry' by the other. Offset the baby units and mute the path you are not using.

Is a second-hand Avent or VTech audio unit enough as backup?

Check the model code on the GOV.UK recall list and the maker's battery notices before you plug it in. Photograph the labels. A swollen parent-unit battery is a reason to stop, not a reason to leave it on charge overnight. See checking a used monitor for a recall.

Can I use the camera's parent unit as the backup instead?

If your smart monitor already has a parent screen that talks to the camera without the app, that *is* a second path — until that hop also depends on the house Wi-Fi. Read the manual: some 'parent units' are just another logged-in tablet. DECT audio is the option that never asks for the password.

Does a backup monitor mean I can leave the room more?

The Lullaby Trust's same-room advice for the first six months does not add an exception for households with two gadgets. Extra ears are extra ears.

Guides · Baby monitors · Dual setup

Should I keep a DECT audio monitor as backup when the Wi-Fi camera drops?

Updated 10 September 2026 · Checked 10 September 2026 · By MayTally research desk — Checked against official UK sources

Is this the same as choosing DECT audio or a Wi-Fi camera?

No. The comparison page asks which one product to buy. This page assumes the camera is already on the wall and asks whether a second, radio-only audio path is worth leaving in the drawer. Philips still sells dedicated DECT audio sets (for example the Avent SCD560 family) as parent-unit products that do not need an app. VTech and others do the same. Budget-list articles often file those sets as 'cheap audio'. The use here is different: outage cover.

The Lullaby Trust: a monitor can never replace a parent or carer's supervision. Stay in the same room for the first six months where you can. Two gadgets do not change that.

When does a Wi-Fi camera go quiet?

Swipe sideways for the full table

Failures a parent unit on DECT does not share
What dropped	What you lose on the camera path	What a paired DECT audio set still does
Home broadband or the ISP	App live view, cloud clips, often push alerts	Keeps the radio hop to its own parent unit
Router reboot or a mesh node that dies	Camera and phone both wait for Wi-Fi	Unaffected if it never joined the router
Vendor app or cloud outage	A black screen and a spinner, even if the radio in the house is fine	No app to fail
Phone battery, or the phone left on charge downstairs	No parent screen in the bedroom	The DECT handset is a separate battery
Phone on a call or in a meeting	Nursery audio mixed with everyone else's notifications	A dedicated speaker you can park on the bedside table

This is a dual-path map, not a claim that DECT audio hears every sound or that a camera 'fails' as a product. Lullaby Trust pages (checked 10 September 2026) still treat any monitor as extra ears, not supervision.

How do I run both without two gadgets shouting?

Give each system its own job Camera: picture, temperature tile, clips. DECT: night audio when the phone is elsewhere. You do not need both speakers on in the same room.
Park the DECT parent unit where you actually sleep Charge it on the same routine as a cordless phone. A flat DECT handset is not a backup.
Keep the two baby units from fighting for the same shelf Two microphones on one chest pick up each other's talk-back and lullabies. Offset them, and turn the camera's speaker down at night if the DECT unit is the one you are listening to.
Do not point two lots of mains cable into the cot The Lullaby Trust wants a clear sleep space. Fix cameras so they cannot fall in; run cables out of reach. The audio baby unit is another box with a cable — treat it the same.
Test the backup on a quiet evening, not during an outage Power the router off for two minutes. Confirm the camera app dies and the DECT parent unit still opens on a spoken word in the nursery. Then turn the router back on.

What does a DECT backup not do?

It does not show you a picture. If you need to see whether a toddler has climbed, the camera (or you in the room) still has that job.
It does not share with nan on the bus. There is no guest invite to revoke. You hand them the parent unit or you do not.
It does not replace safer sleep. No evidence it prevents SIDS. Movement and oxygen gadgets are a different product class — the Lullaby Trust discusses those separately.
It is not the same as an analogue hand-me-down. DECT parent and baby units pair. An old analogue set on a shared channel is the neighbour-crossover problem, not a backup.

PSTI's published update period applies to connectable (internet or home-network) products. A DECT-only audio set that never joins Wi-Fi is outside that smart-device list. That is a legal category, not a quality score.

When is keeping the old audio set the practical choice?

If you already own a paired DECT audio monitor that still holds a charge, the incremental cost of 'backup' is a bit of bedside space. If you would have to buy one, weigh that against a power bank for the phone and a camera that has a documented local / Wi-Fi-off mode. Neither purchase is a safer-sleep upgrade.

In shortIn short: a DECT parent unit is a second path for nights the broadband, the app or the phone is not in the room. Run it as backup audio, not as a second opinion on whether the baby is fine. A parent or carer in the room for the first six months is still the Lullaby Trust baseline.

Questions parents ask

Will two monitors interfere with each other?: A DECT audio set uses the European cordless-phone band; a Wi-Fi camera uses your 2.4 or 5 GHz network. They are not the same radio. They can still annoy you if both speakers are on, or if talk-back from one is picked up as a 'cry' by the other. Offset the baby units and mute the path you are not using.
Is a second-hand Avent or VTech audio unit enough as backup?: Check the model code on the GOV.UK recall list and the maker's battery notices before you plug it in. Photograph the labels. A swollen parent-unit battery is a reason to stop, not a reason to leave it on charge overnight. See checking a used monitor for a recall.
Can I use the camera's parent unit as the backup instead?: If your smart monitor already has a parent screen that talks to the camera without the app, that *is* a second path — until that hop also depends on the house Wi-Fi. Read the manual: some 'parent units' are just another logged-in tablet. DECT audio is the option that never asks for the password.
Does a backup monitor mean I can leave the room more?: The Lullaby Trust's same-room advice for the first six months does not add an exception for households with two gadgets. Extra ears are extra ears.

Sources

Official pages first. If this page and the official page disagree, the official page wins.

The Lullaby Trust — Baby monitors — checked 10 September 2026
Philips — Baby Monitor+ app privacy notice (parent unit vs app streaming) — checked 10 September 2026
NCSC — Smart devices: new law (PSTI applies to internet or home-network devices) — checked 10 September 2026
GOV.UK — Product Safety Alerts, Reports and Recalls — checked 10 September 2026

This is information, not a guarantee of any payment, and not medical, legal or product-safety advice for your home. Prices and rules change; figures carry the date they were checked. Recall status comes from official records only — a product we cannot find is not a safety all-clear. Tell us if we got a fact wrong.