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Door entry system buying guide

Updated: 22 October 2026

You are replacing a dead handset, or buying a first door phone, and the amazon.co.uk rows all look like the same white monitor. A door entry system buying guide is the order of checks before a model name: how many homes that door serves, how many cores are already in the wall, whether you must see the caller, whether anyone must answer from a phone, and whether a lock and a UK plug are actually in the box. Prices and the eight kits stay on the [Door intercom comparison](/hub/electronic-surveillance/door-intercom). Products Compared editorial team, 19 October 2026, from these amazon.co.uk listings. Not a lab test. A qualifying amazon.co.uk purchase can earn us a commission.

You are replacing a dead handset, or buying a first door phone, and the amazon.co.uk rows all look like the same white monitor.

Our top picks

Mercury Mercury 2-wire audio door phone

Best overall

Mercury Mercury 2-wire audio door phone
5.8/10about £28.99
View offer
EZVIZ EZVIZ CP5 7-inch Wi-Fi video door phone

Rank 2

EZVIZ EZVIZ CP5 7-inch Wi-Fi video door phone
9.2/10about £161.49
View offer
TMEZON TMEZON MZ-V20 7-inch wired video intercom

Best value

TMEZON TMEZON MZ-V20 7-inch wired video intercom
8.8/10about £79.99
View offer
On this page
  1. 1.One door, one home, or a block
  2. 2.Cable you already have
  3. 3.Picture, phone, and lock
  4. 4.Weather code and the UK plug
  5. 5.The short list after the checks

One door, one home, or a block

Count the households that door actually opens before you count features. A single call button serves one home. Two screens in the same house are still one home: the TMEZON two-monitor title says a 1-family house. A shared street door is a different object. The panel has to call the right flat, and the frame is often outside your demise. If the door serves more than your household, stop and read door intercom for a flat before you order. For one house door, voice is enough when you can already see the step. A camera matters when the step is dark or out of sight. Mercury, Dioche, and Fockety are the voice rows. Everything else is a monitor.

Cable you already have

Open the old handset, or look at the spare cores, before you trust a line that says the kit suits most doors. The Mercury listing is two-wire audio with a 1 m UK lead. The TMEZON kits and the QingTianTongYun V168M4 are four-wire or four-core, and they do not include the long cable. The EZVIZ CP5 listing states 2-wire installation and compatibility with a 4-wire system. A UK review of that CP5 says you need two wires indoors. Do not assume an old bell pair will carry a four-wire camera. Hikvision's UK note on reusing old cables is about a matched two-wire video system, not any four-core kit on a single pair. If the wall only has that pair, a four-wire TMEZON is the wrong object unless you pull new cable. That fork is wired vs wireless door intercom. The Winnes bell is local radio. The CP5 still needs a cable. A GSM panel is not in this table.
Mercury Mercury 2-wire audio door phone

Testsieger

Mercury Mercury 2-wire audio door phone
5.8/10about £28.99
View offer

Picture, phone, and lock

A phone app is only useful when someone must answer away from home. Only the EZVIZ CP5 listing states a phone app and remote unlock. UK reviews of the TMEZON MZ-V20 treat no app as a reason to buy, and one buyer returned a set because it would not connect to a phone. If you will not keep an account, do not pay the CP5's £161.49 for a feature you will switch off. A portable Dioche indoor unit can be carried through the house. A second monitor is for the floor you live on. The electric lock is a separate purchase. TMEZON says you can unlock from the monitor and does not name a lock in the box. QingTianTongYun excludes the electric lock and the exit button. Mercury states lock control and does not list a lock. Winnes does not state door release. A fail-secure lock still needs a mechanical way out. A fail-safe lock needs a proper manual release. Do not put the only way out on the unlock key.

Weather code and the UK plug

Read the weather line as the words on that ASIN, not as a certificate. IP54 on Dioche is splashing water. IP65 on the TMEZON MZ-V20 and the Winnes title is water jets, and only where the listing prints the code. Mercury says weatherproof with no IP code, and one of two reviews reports damp on earlier units. EZVIZ says weather proof with no IP code. QingTianTongYun states a rain cover and no IP code. Fockety states no code. Mains indoor units need a BS 1363 plug, or a lead you already know how to terminate. Mercury lists a hardwired UK power lead of 1 m. QingTianTongYun lists a 3-pin UK adapter, and a feature bullet says the power supply is not included, so those lines conflict. The EZVIZ field reads "36 EU", which does not confirm a UK plug. The TMEZON single-monitor listing does not state a UK plug. If the lens leaves your own step, limit the view, tell people, and delete the clips.

The short list after the checks

None of the listings claims a test to BS EN 62820-1-1. Four cores and no app points at the MZ-V20. A reusable pair and a phone answer points at the CP5, once you accept the unconfirmed plug. No cable and no unlock points at the Winnes.

Common questions

Do I need an app?
Only if someone must answer away from the monitor. If the broadband drops, a wired indoor monitor that does not depend on an account is the one that still rings.
Is the electric lock in the box?
Not on these listings. Budget for the strike, and for a mechanical way out, as a separate job.
Will a wireless kit reach the gate?
Dioche and Fockety claim about 1,000 m with no obstruction. One Dioche UK review reported a working gate at about 50 m. Winnes states up to 80 m, and walls reduce it. Range-test before you fix the bell.
What plug should I expect in the UK?
A BS 1363 three-pin plug, or a lead already terminated for one. If the indoor unit is mains powered and the plug is not stated, do not assume the box is ready for a UK socket.
When is a one-button kit the wrong buy?
When the door serves more than one household. Two monitors in one house are not two flats. Leave the street door to the managing agent.

Related pages

Best video door phone UK

How to install a video door phone

Door intercom

Door intercom for a flat: consent before any screw

Wired vs wireless door intercom: cable or radio kit

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Listings captured 19 October 2026.

  1. BSI, BS EN 62820-1-1:2016+A11:2021 (retrieved 19 October 2026)
  2. Approved Document P (England) (retrieved 19 October 2026)
  3. Tameside Building Control Note 20 (retrieved 19 October 2026)
  4. ICO, home CCTV (retrieved 19 October 2026)
  5. GOV.UK, domestic CCTV (retrieved 19 October 2026)
  6. IEC IP ratings (retrieved 19 October 2026)
  7. Consumer Rights Act 2015, section 9 (retrieved 19 October 2026)
  8. NACD, emergency egress note (retrieved 19 October 2026)