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The Rely Safety team brings decades of life safety expertise, delivering trusted technology to homes and businesses across the U.S. Because home safety shouldn’t be confusing, we design intuitive alarms with clear voice and visual alerts—so families can act quickly and confidently when it matters most.
Protect your home with dependable, hardwired fire detection using the Rely 5400 Photoelectric Smoke Detector. Designed for continuous protection, this alarm connects directly to your home’s electrical system and includes a 9V battery backup to keep you protected even during power outages. Advanced photoelectric sensing technology provides faster response to smoldering fires while helping reduce nuisance alarms caused by cooking or steam. Ideal for whole-home safety, the Rely 5400 is interconnectable—when one alarm sounds, all connected units activate, ensuring everyone is alerted no matter where they are. A loud 85 dB alarm, bright LED indicators, and an easy-access Test/Hush button provide clear alerts and simple operation. Built to meet the latest UL 217 standards, this smoke detector delivers reliable, code-compliant protection you can trust.
More Rely Products
 Rely Essentials 5400 |  Rely RealAlerts 7500 |  Rely Essentials 4500 |  Rely Essentials 6200 |  Rely Essentials 5300 |  Rely Essentials 5500 |  Rely Essentials 5600 | |
|---|---|---|---|---|---|---|---|
Customer Reviews | — | — | — | — | — | — | — |
Price | — | — | — | — | — | — | — |
Detection Type | Smoke | Smoke | Smoke | Carbon Monoxide | Smoke & Carbon Monoxide | Smoke | Smoke & Carbon Monoxide |
Size | 6” Diameter | 6" Diameter | 4” Diameter | 6”H x 2”W | 6” Diameter | 4” Diameter | 6” Diameter |
Power Source | Hardwired, 9V Battery Backup | 10-Year Built-In Battery | 9V Battery, Included | 120V Plug-In, Battery Backup | 9V Battery, Included | 10-Year Built-In Battery | Hardwired, 9V Battery Backup |
UL Standard | UL 217 9th Edition | UL 217 9th Edition | UL 217 & 9th Edition | UL 2034 | UL 217 9th Edition & UL 2034 | UL 217 9th Edition | UL 217 9th Edition & UL 2034 |
Meets US Safety Standards | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Shop Rely RealAlerts
Shop Rely Essentials
Shop Carbon Monoxide Alarms
The Rely Safety team brings decades of life safety expertise, delivering trusted technology to homes and businesses across the U.S. Because home safety shouldn’t be confusing, we design intuitive alarms with clear voice and visual alerts—so families can act quickly and confidently when it matters most.
Protect your home with dependable, hardwired fire detection using the Rely 5400 Photoelectric Smoke Detector. Designed for continuous protection, this alarm connects directly to your home’s electrical system and includes a 9V battery backup to keep you protected even during power outages. Advanced photoelectric sensing technology provides faster response to smoldering fires while helping reduce nuisance alarms caused by cooking or steam. Ideal for whole-home safety, the Rely 5400 is interconnectable—when one alarm sounds, all connected units activate, ensuring everyone is alerted no matter where they are. A loud 85 dB alarm, bright LED indicators, and an easy-access Test/Hush button provide clear alerts and simple operation. Built to meet the latest UL 217 standards, this smoke detector delivers reliable, code-compliant protection you can trust.
More Rely Products
Rely Essentials 5400 | Rely RealAlerts 7500 | Rely Essentials 4500 | Rely Essentials 6200 | Rely Essentials 5300 | Rely Essentials 5500 | Rely Essentials 5600 |
|---|---|---|---|---|---|---|
| Customer Reviews | ||||||
— | — | — | — | — | — | — |
| Price | ||||||
| — | — | — | — | — | — | — |
| Detection Type | ||||||
| Smoke | Smoke | Smoke | Carbon Monoxide | Smoke & Carbon Monoxide | Smoke | Smoke & Carbon Monoxide |
| Size | ||||||
| 6” Diameter | 6" Diameter | 4” Diameter | 6”H x 2”W | 6” Diameter | 4” Diameter | 6” Diameter |
| Power Source | ||||||
| Hardwired, 9V Battery Backup | 10-Year Built-In Battery | 9V Battery, Included | 120V Plug-In, Battery Backup | 9V Battery, Included | 10-Year Built-In Battery | Hardwired, 9V Battery Backup |
| UL Standard | ||||||
| UL 217 9th Edition | UL 217 9th Edition | UL 217 & 9th Edition | UL 2034 | UL 217 9th Edition & UL 2034 | UL 217 9th Edition | UL 217 9th Edition & UL 2034 |
| Meets US Safety Standards | ||||||
| Yes | Yes | Yes | Yes | Yes | Yes | Yes |