Can you confirm that this is mains operated with battery back up?

The Firex KF30 is mains operated with a replaceable back up battery. Note that there are two other models, the KF30LL is mains operated with a sealed in long life lithium battery and the KF30R is mains operated with a rechargeable battery.

I have a firex 4899 which needs replacing. is this the same case and wiring. ie. can i replace it myself or do i need an electrician?

I have both smoke alarms and heat sensor ( Kitchen ) and they were exactly the same electrical connections. Easy to replace if you are an average- expert DIYer. The company has a help line and are very good with advice. Hope this helps less than 5 minutes to change over. Push connectors.

How many pins does it have on the back?

3 pins. Two ( for live and neutral ) and one to interlink to your smoke alarms

Firex Kf30 Kidde Firex Alarm White | Desertcart Cote D' Ivoire

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Description

🔥 Stay ahead of danger with smart, connected protection! 🔗

SECURE INSTALLATION - Tamper-resistant locking device guarantees safety and peace of mind
USER FRIENDLY CONTROL - Combined test and hush button for quick silencing and easy maintenance
RELIABLE POWER ASSURANCE - Mains operated with 9V alkaline battery backup ensures uninterrupted alert
SEAMLESS NETWORKED SAFETY - Connects with up to 23 Firex or Kidde alarms for whole-home protection
SMART SOURCE IDENTIFICATION - Pinpoints the exact alarm triggering the alert within the network

The Firex KF30 Kidde Firex Alarm is a mains-powered smoke alarm with a 9V battery backup, capable of interlinking with up to 23 other Firex or Kidde alarms. Featuring a tamper-resistant locking device, combined test and hush button, and the ability to identify the source unit in an interconnected network, it offers reliable, whole-home fire safety with easy setup and maintenance.

Specifications

ASIN	B019OD3OTM
Batteries	1 Product Specific batteries required. (included)
Batteries Required?	Yes
Batteries included?	Yes
Battery Cell Type	Alkaline
Best Sellers Rank	5,964 in DIY & Tools ( See Top 100 in DIY & Tools ) 40 in Smoke Alarms
Colour	White
Customer Reviews	4.5 4.5 out of 5 stars (175)
Date First Available	22 Dec. 2015
Included Components	Heat Alarm, Fixing screws, Mounting bracket, 9V Alkaline battery
Item Package Quantity	1
Item Weight	213 g
Item model number	KF30
Manufacturer	Kidde
Measurement System	Metric
Number of Pieces	1
Part Number	KF30
Power Source	Battery Powered
Product Dimensions	6.8 x 13.5 x 13.5 cm; 213.19 g
Style	Classic

Reviews

U**R

Easy set up

Good fire alarms, easy set up.

7.12.2025

M**Y

I would recommend

Very happy with firex alarm

6.01.2026

G**.

Intermittent fault

Intermittent fault, alarms for no reason, contacted the company and they replaced immediately, very good service. New alarm seems ok so far.

10.09.2023

D**D

Very easy to replace for an expired alarm.

18.12.2025

I**5

Exactly what I needed

Perfect replacement for an older one that had stopped working.

18.12.2025

R**I

Good replacement

Arrived as described and fitted without any problems

20.10.2025

S**M

Heat alarm

Great quality heat alarm very sensitive

25.01.2026

S**4

Easy replacement

Replacement for expired alarm , easy to replace

14.05.2025

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2 weeks ago

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Sold byAmazon Cote D' IvoireDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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Smooth transaction and product arrived in perfect condition.

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Good experience, but the tracking updates could be better.

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