---
product_id: 24327779
title: "3/PACK FIRST ALERT/BRK BRANDS ONELINK SA521CN-3ST WIRELESS AC/DC SMOKE ALARM"
brand: "brand: first alert/brk brands"
price: "FREE"
currency: EUR
in_stock: false
url: https://www.desertcart.es/products/24327779-3-pack-first-alert-brk-brands-onelink-sa521cn-3st-wireless
store_origin: ES
region: Spain
---

# 3/PACK FIRST ALERT/BRK BRANDS ONELINK SA521CN-3ST WIRELESS AC/DC SMOKE ALARM

**Brand:** brand: first alert/brk brands
**Price:** FREE
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** 3/PACK FIRST ALERT/BRK BRANDS ONELINK SA521CN-3ST WIRELESS AC/DC SMOKE ALARM by brand: first alert/brk brands
- **How much does it cost?** FREE with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/24327779-3-pack-first-alert-brk-brands-onelink-sa521cn-3st-wireless)

## Best For

- brand: first alert/brk brands enthusiasts

## Why This Product

- Trusted brand: first alert/brk brands brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

Wirelessly interconnect alarms. 120VAC hardwired wireless interconnect smoke alarm with battery backup. To expand protection to include both existing hardwired alarms and new wireless alarms, simply replace one existing hardwired alarm with Onelink, then add Onelink battery operated alarms elsewhere and when one alarm in either series alarms, all alarms will be notified. Easily link alarms together with the press of a button. When one alarm sounds, they all sound for maximum whole home protection. Photoelectric smoke sensor reduces nuisance alarms from cooking smoke or shower steam. Easy access battery drawer: no need to remove alarm from ceiling to change battery. 10-year limited warranty. Meets UL standards.

## Features

- Battery backup, provides consistent protection for added safety during power outages
- Battery backup, provides consistent protection for added safety during power outages
- Photoelectric smoke sensing, optimal protection from smoldering fires
- Meets UL217 standard
- FCC compliant.
- ›See more product details

## Images

![3/PACK FIRST ALERT/BRK BRANDS ONELINK SA521CN-3ST WIRELESS AC/DC SMOKE ALARM - Image 1](https://images-na.ssl-images-amazon.com/images/I/41I-X8tgITL.jpg)

---

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**Shop now:** [https://www.desertcart.es/products/24327779-3-pack-first-alert-brk-brands-onelink-sa521cn-3st-wireless](https://www.desertcart.es/products/24327779-3-pack-first-alert-brk-brands-onelink-sa521cn-3st-wireless)

---

*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-01-23*