Does this fit the old 120-1123C

Hi, I cannot remember exactly which old model I had, but there is a new base / mounting plate supplied in the box and a new different connector. If your old one is not too old, the old base plate and connector may be compatible. Either way it is not a difficult job and everything is provided.

Would this be suitable for the Firex 120-1123c?

I'm afraid I don't know the different model types. If your old one is mains powered, and possibly linked to a second alarm, it should be okay. A new mounting plate and connector is supplied with the new device, (in the Box).

Hi, i have the kidde firex model 4870 hardwired in my house and i need to replace them. do these alarms have the same wiring connection as the 4870?

You may need to change the connector that attaches to the mains power supply and connects to the alarm which is supplied in the box.

Is this suitable for mounting near a bathroom (approx 3m from shower, but mounted on landing ceiling) or do I need an ionisation alarm

Yes this best for mounting near a bathroom, as this is an optical alarm, it will reduce the amount of nuisance alarms as opposed to an ionisation alarm.

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Replacement for Kidde KF10 Mains Powered Smoke Alarms

Replacement for Kidde KF10 Mains Powered Smoke Alarms

Product ID: 388701532

Details

Brand
Kidde
Style
Classic
Power source
Mains Powered
Colour
White
Alarm
Visual
Sensor type
Ionization

🔋230V mains + 9V battery backup

🔗Interlink with older KF series alarms

🛡️6-year manufacturer warranty

Rp1511000

Duties & taxes included

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Sold byAmazon IndonesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔥 Stay ahead of danger with Kidde KF20 — your smart shield against fire! 🛡️

SEAMLESS INTEGRATION - Easily interlink with existing Kidde KF series alarms for comprehensive, synchronized fire detection.
EFFORTLESS INSTALLATION - Supplied with fixings and a colored dust cover, perfect for hassle-free setup and decorating without dust worries.
LEGISLATIVELY COMPLIANT - Fully meets 2022 Scottish fire safety regulations and BS EN 14604:2005 standards for trusted reliability.
UNINTERRUPTED PROTECTION - Mains powered with 9V alkaline battery backup ensures your home stays safe even during power outages.
PEACEFUL NIGHTS GUARANTEED - Low battery chirp silenced for 8 hours with a simple hush button—no more annoying false alarms.

The Kidde KF20 is a mains-powered optical smoke alarm with a 9V battery backup, designed as a direct replacement for older Kidde KF10 and related models. It features interlink capability with other KF series alarms, a combined test/hush button, LED indicators, and complies with the latest 2022 Scottish fire safety legislation. Backed by a 6-year warranty, it offers reliable, modern fire detection technology for peace of mind in any home.

Specifications

Alarm	Visual
Asin	B09N7BFW6P
Best Sellers Rank	2,967 in DIY & Tools (See Top 100 in DIY & Tools) 19 in Smoke Alarms
Brand	Kidde
Colour	White
Country Of Origin	China
Customer Reviews	4.7 4.7 out of 5 stars (392) 4.7 out of 5 stars
Included Components	9V back-up battery, Kidde KF20 mains-powered optical smoke alarm, Product manual, Screws and rawl plugs for secure fixing to ceiling
Item Type Name	Mains Powered Optical Smoke Alarm
Manufacturer	Kidde
Manufacturer Warranty Description	6 year warranty.
Model Number	KEKF10-RA
Number Of Items	1
Operating Humidity	Natural
Power Source	Mains Powered with Battery Backup
Product Style	Classic
Sensor Type	Ionization
Unit Count	1.0 count

Reviews

User

Very good for the money it's a lifesaver...

It was great, a like for like swap with one I installed 6 years ago, the one I bought was the updated version and was a straight swap with the same wiring connections although I didn't need to swap the back plate I still did as the old one was yellowing and would off looked odd. It also comes with a Duracell battery so a good quality.

22.01.2026

User

Excellent purchese

Good value easy to fit

11.06.2026

User

Good quality

Straight swap easy to install loud noise

18.07.2026

User

Good quality

Yes this worked!

19.07.2026

User

Easy to fit

Straight forward to fit came with Duracell battery very loud alarm when I tested it.

1.01.2026

User

Fitted perfectly delivered so fast

Excellent replacement for our smoke alarm fitted perfectly

11.06.2026

User

Fire safe

Easy to install. The installation instuctoojare clear to understand and my house safe once again.I will purchase again.

16.03.2026

User

Smoke detector replacement

Exactly what I ordered, and so fast free delivery, Perfect and will order against from Amazon *****

28.06.2026

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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Rp1511000

Duties & taxes included

In stock

Sold byAmazon IndonesiaDelivered 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 Indonesia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

View all Trustpilot reviews