---
product_id: 86427628
title: "First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units)"
brand: "first alert llc"
price: "€ 39.82"
currency: EUR
in_stock: false
category: "Hi"
url: https://www.desertcart.hr/products/86427628-first-alert-sa521cn-wireless-interconnected-hardwired-photoelectric-smoke-alarm-battery
store_origin: HR
region: Croatia
---

# First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units)

**Brand:** first alert llc
**Price:** € 39.82
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) by first alert llc
- **How much does it cost?** € 39.82 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/86427628-first-alert-sa521cn-wireless-interconnected-hardwired-photoelectric-smoke-alarm-battery)

## Best For

- first alert llc enthusiasts

## Why This Product

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

## Description

Full description not available

## Images

![First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) - Image 1](https://images-na.ssl-images-amazon.com/images/I/31k%2B3axPOmL.jpg)
![First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) - Image 2](https://images-na.ssl-images-amazon.com/images/I/51Mpnh8mzYL.jpg)
![First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) - Image 3](https://images-na.ssl-images-amazon.com/images/I/41tySGNHX4L.jpg)
![First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) - Image 4](https://images-na.ssl-images-amazon.com/images/I/51PrWirnpsL.jpg)
![First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm Battery Backup (2.Units) - Image 5](https://images-na.ssl-images-amazon.com/images/I/51CRMsOsIsL.jpg)

---

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**Shop now:** [https://www.desertcart.hr/products/86427628-first-alert-sa521cn-wireless-interconnected-hardwired-photoelectric-smoke-alarm-battery](https://www.desertcart.hr/products/86427628-first-alert-sa521cn-wireless-interconnected-hardwired-photoelectric-smoke-alarm-battery)

---

*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-10*