---
product_id: 9683869
title: "Kidde 408-900-0102-02 KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm"
brand: "kidde"
price: "R$28"
currency: BRL
in_stock: false
reviews_count: 8
url: https://www.desertcart.com.br/products/9683869-kidde-408-900-0102-02-kn-cosm-b-battery-operated
store_origin: BR
region: Brazil
---

# Battery Powered Talking Alarm Hush Feature Kidde 408-900-0102-02 KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm

**Brand:** kidde
**Price:** R$28
**Availability:** ❌ Out of Stock

## Summary

> 🔊 Safety Speaks Volumes!

## Quick Answers

- **What is this?** Kidde 408-900-0102-02 KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm by kidde
- **How much does it cost?** R$28 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/9683869-kidde-408-900-0102-02-kn-cosm-b-battery-operated)

## 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

- • **Easy Testing:** The test/reset button allows for quick checks of alarm functionality, ensuring peace of mind.
- • **Visual Indicators:** Two LED indicators keep you informed with flashing alerts for normal operation and alarm conditions.
- • **Stay Safe, Stay Smart:** This battery-operated alarm ensures your home is protected even during power outages.
- • **Nuisance-Free Experience:** With the hush feature, you can silence false alarms without compromising safety.
- • **Voice Alerts for Clarity:** The talking alarm feature provides clear notifications, so you know exactly what’s happening.

## Overview

The Kidde 408-900-0102-02 KN-COSM-B is a battery-operated combination carbon monoxide and smoke alarm that features a talking alarm for clear notifications, a hush feature to silence nuisance alarms, and visual LED indicators for operational status. It operates on AA batteries, ensuring protection even during power outages, and includes a safeguard to prevent accidental mounting without batteries.

## Description

Kidde 408-900-0102-02 KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm

## Features

- Test/Reset Button – Tests alarm circuitry and triggers the voice announcement. AA batteries required (best with Polaroid AA batteries)
- LEDs – Two LEDs are provided. Flashing green for normal operation and flashing red for alarm condition.
- Hush Feature – Temporarily silences nuisance alarms.
- Battery Powered – Provides protection even during power outages when many fire and carbon monoxide incidents occur.
- Battery Safeguard – Ensures the unit cannot be accidentally mounted without batteries installed.

## Images

![Kidde 408-900-0102-02 KN-COSM-B Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Talking Alarm - Image 1](https://m.media-amazon.com/images/I/91W0EG3QIgL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Peace of mind
  

*by P***E on Reviewed in the United States on January 11, 2019*

I bought 3 of these to replace the 3 I had that lasted over the exasperation date. Ten years worth of peace of mind. They are easy to install.  I hung mine and it only takes 5 mins. each to set them up.  Very good product.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Works great. 10 Year lifetime
  

*by K***R on Reviewed in the United States on July 27, 2019*

This is a replacement for another Kiddie Talking alarm we had.  The Carbon Monoxide unit had an eight year life but lasted an extra 3 months before we had to replace.  We were very pleased with the old one.  This new one has an increased Carbon Monoxide unit life to 10 years.  Also has a "hush" button that you can push to silence the alarm if it goes off when cooking, etc.  We also like that it talks as well as beeps, so you don't have to remember what a particular beep pattern means.  It will say "Fire, Fire",  "Carbon Monoxide"; even "Low Battery" so you know when to replace batteries.  Great product.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Will buy again in 10 yrs
  

*by L***E on Reviewed in the United States on October 14, 2019*

We replaced 7 Kidde Battery-Operated Combination Carbon Monoxide and Smoke Alarms that were installed in our house when we bought it in 2013. They were all dated 2009. The new ones came with batteries and were super easy to install. We didn't have to change any wiring or bases.

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**Shop now:** [https://www.desertcart.com.br/products/9683869-kidde-408-900-0102-02-kn-cosm-b-battery-operated](https://www.desertcart.com.br/products/9683869-kidde-408-900-0102-02-kn-cosm-b-battery-operated)

---

*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-02-28*