---
product_id: 410860802
title: "Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up"
brand: "kidde"
price: "FREE"
currency: SGD
in_stock: false
category: "Kidde"
url: https://www.desertcart.sg/products/410860802-kidde-firex-kf20-optical-smoke-alarm-mains-operated-with-battery
store_origin: SG
region: Singapore
---

# Photoelectric optical sensor Battery backup for power cuts Interlink up to 23 alarms Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up

**Brand:** kidde
**Price:** FREE
**Availability:** ❌ Out of Stock

## Summary

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

## Quick Answers

- **What is this?** Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up by kidde
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/410860802-kidde-firex-kf20-optical-smoke-alarm-mains-operated-with-battery)

## Best For

- kidde enthusiasts

## Why This Product

- Trusted kidde brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Tamper-Proof Design:** Locking device keeps your safety system secure and intact
- • **Smart Smoke Detection:** Photoelectric sensor reduces false alarms from steam and cooking
- • **User-Friendly Control:** Combined test/hush button for quick, easy management
- • **Seamless Safety Network:** Interlink up to 23 alarms for whole-home protection
- • **Uninterrupted Vigilance:** Mains powered with battery backup ensures 24/7 reliability

## Overview

The Firex KF20 is a mains-operated optical smoke alarm with a battery backup, designed for reliable detection of slow smouldering fires. It supports interlinking up to 23 alarms for comprehensive home coverage, features a photoelectric sensor to minimize false alarms, and includes tamper-resistant locking and a combined test/hush button for ease of use. Certified to BSi Kitemark standards, it meets current building regulations and ensures continuous protection even during power outages.

## Description

Product Description Kidde Firex smoke alarms offer the very best in quality and reliability. Certified to the highest BSi Kitemark standards and offering a wide range of alarms to suit most applications you can be assured that you are in safe hands. The KF20 is compliant with the latest in building regulations for new housing. The KF20 utilises photo-electric (optical) detection facility. They are best suited where there is a danger of slow smouldering fires such as those caused by cigarettes for example on foam filled furniture or bedding. They are less prone to nuisance alarms caused by steam or cooking particles. They can be disposed of with general household waste. Set Contains: 1 x KF2, Battery & Instructions

## Features

- Interlink with up to 23 Firex hard-wired alarms
- Combined test/hush button
- Auto reset
- Tamper-resistant locking device
- Mains operation
- The Kidde KF2 smoke alarm is a mains powered alarm contains battery in it as a backup in case of a power cut.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B006J56XQU |
| ASIN  | B006J56XQU |
| Alarm | Visual |
| Batteries  | 1 9V batteries required. (included) |
| Best Sellers Rank | #152,849 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #172 in Smoke Alarms |
| Brand | Kidde |
| Color | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (1,561) |
| Customer reviews | 4.6 4.6 out of 5 stars (1,561) |
| Date First Available  | 9 August 2012 |
| Global Trade Identification Number | 00020967049737 |
| Is Discontinued By Manufacturer  | No |
| Item Part Number | KF2 |
| Item Type Name | Mains Optical Smoke Alarm |
| Item Weight | 280 Grams |
| Item model number  | KF2 |
| Manufacturer | Kidde |
| Manufacturer  | Kidde |
| Mfr Part Number | KF2 |
| Model Number | KF2 |
| Power Source | Battery Powered |
| Product Dimensions  | 13.3 x 13.3 x 3.9 cm; 280 g |
| Product Style | Back Up |
| Sensor Type | Photoelectric |
| UPC | 020967049737 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Kidde
- **Colour:** White
- **Item weight:** 280 Grams
- **Power source:** Battery Powered
- **Style:** Back Up

## Images

![Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up - Image 1](https://m.media-amazon.com/images/I/515CCoZk4qL.jpg)

## Frequently Bought Together

- Kidde Firex KF20 Optical Smoke Alarm - Mains Operated with Battery Back Up
- Twin Pack Kidde Firex KF20 Mains Powered Optical Smoke Alarm with 9V Back Up Batteries | KF2 | 4973
- Firex KF30 Kidde Firex Alarm, White

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**Shop now:** [https://www.desertcart.sg/products/410860802-kidde-firex-kf20-optical-smoke-alarm-mains-operated-with-battery](https://www.desertcart.sg/products/410860802-kidde-firex-kf20-optical-smoke-alarm-mains-operated-with-battery)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-10-17*