# TLDR Review: First Alert Smoke & Carbon Monoxide Alarm with Battery Backup *Published: 2024-12-10 | Updated: 2025-01-25 | Source: https://shopsavvy.com/reviews-tldr/first-alert-smoke-and-carbon-monoxide-alarm-with-battery-backup* --- ## Verdict The First Alert SC9120B is a reliable choice for smoke and carbon monoxide detection, offering easy installation, long-term performance, and good value. **Top pro:** Straightforward installation process, especially for existing First Alert models. **Top con:** Minor challenges with wiring during installation. ## Product: First Alert Smoke & Carbon Monoxide Alarm with Battery Backup **Brand:** BRK Brands [Compare prices and price history on ShopSavvy](https://shopsavvy.com/products/first-alert-smoke-and-carbon-monoxide-alarm-with-battery-backup) ## Pros - Straightforward installation process, especially for existing First Alert models. - Clear instructions provided along with necessary components like batteries and wiring adapters. - Reliable dual functionality for detecting smoke and carbon monoxide. - Battery backup feature ensures continuous protection during power outages. - Reasonable price, particularly when purchased in multi-packs. - High consumer satisfaction regarding longevity and features like dust covers. ## Cons - Minor challenges with wiring during installation. - Need for potential buyers to verify compatibility with existing wiring systems. ## Pros vs Cons at a Glance | Pros | Cons | |------|------| | Straightforward installation process, especially for existing First Alert models. | Minor challenges with wiring during installation. | | Clear instructions provided along with necessary components like batteries and wiring adapters. | Need for potential buyers to verify compatibility with existing wiring systems. | | Reliable dual functionality for detecting smoke and carbon monoxide. | | | Battery backup feature ensures continuous protection during power outages. | | | Reasonable price, particularly when purchased in multi-packs. | | | High consumer satisfaction regarding longevity and features like dust covers. | | ## Last Seen Prices *Each price is the last one ShopSavvy observed, between 2024-09-27 and 2025-01-25; it may have changed since.* | Retailer | Price | Availability | Last seen | |----------|-------|-------------|-----------| | [Mercari](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/jPuIugeBCnqmItkvgaav?source=shopsavvy&medium=article-review-tldr) | $36.00 | In Stock | 2024-09-27 (may have changed) | | [MrSupply.com](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/gewIWfUObGPbIcUl3Pgu?source=shopsavvy&medium=article-review-tldr) | $39.35 | In Stock | 2024-09-27 (may have changed) | | [Energy Avenue](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/dKRPVNrWdNR2D35MDyYp?source=shopsavvy&medium=article-review-tldr) | $39.84 | In Stock | 2024-09-27 (may have changed) | | [Dale Electric Supply Co.](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/PBZRAEuSoW4Ma5wpnF5N?source=shopsavvy&medium=article-review-tldr) | $41.82 | In Stock | 2025-01-25 (may have changed) | | [Hardware World](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/XoCtdSWIYxzZbhH5OzQO?source=shopsavvy&medium=article-review-tldr) | $43.73 | In Stock | 2024-09-27 (may have changed) | | [Capital Electric Supply](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/kf0ioJkALfYwcIDhMU2U?source=shopsavvy&medium=article-review-tldr) | $44.32 | In Stock | 2025-01-25 (may have changed) | | [Wholesale Home](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/SrUqj3raUWB81XnnVKMe?source=shopsavvy&medium=article-review-tldr) | $45.99 | In Stock | 2025-01-25 (may have changed) | | [OneSource Distributors](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/64b90e44-e1b3-58a7-69b3-a8826936e870?source=shopsavvy&medium=article-review-tldr) | $46.74 | In Stock | 2025-01-25 (may have changed) | | [World Electric](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/dv8DkY0i4JEWDB1WjbGU?source=shopsavvy&medium=article-review-tldr) | $47.20 | In Stock | 2025-01-25 (may have changed) | | [National Supply Network](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/8elXsQbn7HQ6gabnQk0V?source=shopsavvy&medium=article-review-tldr) | $48.38 | In Stock | 2024-09-27 (may have changed) | | [Walmart](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/E8YHXkJgQ9qEHfeP7A8e?source=shopsavvy&medium=article-review-tldr) | $49.98 | In Stock | 2024-09-27 (may have changed) | | [BuyRite Electric](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/f4741177-7cab-2505-a7b6-7221769c59fb?source=shopsavvy&medium=article-review-tldr) | $51.00 | In Stock | 2025-01-25 (may have changed) | | [Surry General Store](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/6juWI9pcM6PeP2FDN0lu?source=shopsavvy&medium=article-review-tldr) | $53.39 | In Stock | 2025-01-25 (may have changed) | | [Smoke Alert Home Fire Safety](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/bwNhRlGmbpTCHAihlMS7?source=shopsavvy&medium=article-review-tldr) | $54.95 | In Stock | 2025-01-25 (may have changed) | | [Sears](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/6ce91243-f4b1-01c2-fce5-9cc8df45ab32?source=shopsavvy&medium=article-review-tldr) | $55.95 | In Stock | 2024-09-27 (may have changed) | | [Electric Bargain Store](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/WwCWQan9PQcxFeX0tDyy?source=shopsavvy&medium=article-review-tldr) | $57.38 | In Stock | 2025-01-25 (may have changed) | | [OpticsPlanet.com](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/xvp5tL1vyWFXhyNJUfiP?source=shopsavvy&medium=article-review-tldr) | $64.49 | In Stock | 2025-01-25 (may have changed) | | [DK Hardware](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/w6C222awCmQRs62Kh8FB?source=shopsavvy&medium=article-review-tldr) | $65.23 | In Stock | 2025-01-25 (may have changed) | | [Codale](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/e6d158a1-5186-38dc-13ce-12586b539def?source=shopsavvy&medium=article-review-tldr) | $67.24 | In Stock | 2025-01-25 (may have changed) | | [Virventures.com](https://shopsavvy.com/api/redirect/products/cq0Yo0WBmWMTfgQD3Mcn/offers/6735d19f-1c3b-dc21-7d79-7bdd6b24b70b?source=shopsavvy&medium=article-review-tldr) | $68.20 | In Stock | 2025-01-25 (may have changed) | [See every retailer and the full price history on ShopSavvy](https://shopsavvy.com/products/first-alert-smoke-and-carbon-monoxide-alarm-with-battery-backup) --- *About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from ShopSavvy's price data (each price shows when it was last seen).* *Machine-readable access: append `.md` to any ShopSavvy URL, or send `Accept: text/markdown`, to get this page as Markdown. For the same catalogue as structured JSON — product lookup by barcode/ASIN/URL, live prices across retailers, and price history — see ShopSavvy's MCP server at https://shopsavvy.com/agents and the Data API at https://shopsavvy.com/data.*