Title says mains alarm. Does this actually work off the 240v mains domestic supply. There is nothing in the description that mentions transformer, ect

The product voltage is 230, it works perfectly well off 240 volt with no need for a transformer as you mention.

Hi. The title of the listing says the smoke alarm is the optical kind. The listing's description says it is the ionisation kind. What is the product?

The KF2 (which for your information is now the KF20 which is supplied) is an optical smoke alarm.I will amend the listing description.

Does this alarm come with a plug?

It comes with a connection plug to connect the direct mains supply to the alarm.

Does it fit the plates of Deta 1111 model?

No, you will need to change the mounting/base plate which is supplied with the alarm.

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Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up

Product ID: 53089982

Details

Alarm
Visual
Brand
Kidde
Colour
White
Global Trade Identification Number
Item weight
280 Grams
Manufacturer
Kidde

📡Photoelectric optical sensor

🔋Battery backup for power cuts

🔗Interlink up to 23 alarms

R1240

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🔥 Stay ahead of danger with smart, connected smoke detection! 🔥

SMART SMOKE DETECTION - Photoelectric sensor reduces false alarms from steam & cooking
USER FRIENDLY CONTROL - Combined test/hush button for easy maintenance
TAMPER RESISTANT DESIGN - Locking device ensures secure installation and peace of mind
UNINTERRUPTED PROTECTION - Mains powered with reliable battery backup
SEAMLESS HOME SAFETY NETWORK - Interlink up to 23 alarms for synchronized alerts

The Firex KF20 Optical Smoke Alarm by Kidde is a mains-operated, photoelectric smoke detector with battery backup, designed to interlink up to 23 units for comprehensive home safety. Certified to BSi Kitemark standards and compliant with latest building regulations, it offers reliable detection of slow smouldering fires while minimizing false alarms. Featuring a tamper-resistant locking device and combined test/hush button, it ensures secure, user-friendly operation.

Specifications

ASIN	B006J56XQU
Alarm	Visual
Best Sellers Rank	3,823 in DIY & Tools ( See Top 100 in DIY & Tools ) 22 in Smoke Alarms
Brand	Kidde
Colour	White
Customer Reviews	4.6 out of 5 stars 1,577 Reviews
Global Trade Identification Number	00020967049737
Item Part Number	KF2
Item Type Name	Mains Optical Smoke Alarm
Item Weight	280 Grams
Item weight	280 Grams
Manufacturer	Kidde
Model Number	KF2
Part Number	KF2
Power source	Battery Powered
Product Style	Back Up
Sensor Type	Photoelectric
Style	Back Up
UPC	020967049737
Unit Count	1.0 count

Reviews

J**R

Smoke alarm

I was replacing an alarm and purchased same model so it would fit which it did perfectly and easy to fit. Speedy delivery good packaging and good price

25.07.2026

K**Y

Read the installation instructions

Easy to install and test. The alarm is a quality build and does what it is designed to do. Recommended.

2.06.2026

G**U

Smoke alarm

Easy to install

31.05.2026

M**S

Easy to install

Easy to install pain in the bum though cos you have to replace the Duracell battery regularly one a year and it has to be Duracell or it won’t work properly

8.08.2026

A**H

Perfect fit for an exchange. Very easy to fit

Great - perfect fit for our old alarm. All seems to work perfectly

25.05.2026

J**H

Straightforward installation

Easy to fit, especially if replacing an earlier alarm.

4.07.2026

A**R

Good smoke alarm

Excellent

28.06.2026

A**R

Value for money and safety

I have used this product for over 20 years and they are very good value for money and provide safety for the home

8.07.2026

E**S

Détecteur de fumée

Je souhaite garder le produit donc vous pouvez ŕedebiter le montant de son prix

25.12.2020

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3 weeks ago

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R1240

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Meera L.

Smooth transaction and product arrived in perfect condition.

3 weeks ago

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