Shop Rely RealAlerts
Shop Rely Essentials
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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 reliable fire safety using the Rely Essentials 5500 smoke detector with a 10-year sealed lithium battery. Designed for dependable early warning, this compact smoke alarm uses advanced photoelectric sensing technology to detect slow, smoldering fires more effectively while helping reduce nuisance alarms caused by cooking smoke or steam. Its compact 4-inch profile blends easily into bedrooms, hallways, living rooms, apartments, and other residential spaces where a discreet but powerful smoke detector is needed. The battery-operated design allows for quick and flexible installation without wiring, making it ideal for homeowners, landlords, property managers, and apartment units. A large Test/Hush button lets you easily test the smoke alarm or temporarily silence nuisance alerts, while the LED indicator provides clear status updates so you know the device is operating properly. When smoke is detected, the loud 85 dB alarm sounds immediately to help alert occupants and support a faster response. Built to meet UL 217 9th Edition smoke alarm standards, the Rely 5500 ensures constant 24/7 security for your home.
More Rely Products
 Rely Essentials 5500 |  Rely RealAlerts 7500 |  Rely Essentials 4500 |  Rely Essentials 6200 |  Rely Essentials 5300 |  Rely Essentials 5400 |  Rely Essentials 5600 | |
|---|---|---|---|---|---|---|---|
Customer Reviews | — | — | — | — | — | — | — |
Price | — | — | — | — | — | — | — |
Detection Type | Smoke | Smoke | Smoke | Carbon Monoxide | Smoke & Carbon Monoxide | Smoke | Smoke & Carbon Monoxide |
Size | 4” Diameter | 6" Diameter | 4” Diameter | 6”H x 2”W | 6” Diameter | 6” Diameter | 6” Diameter |
Power Source | 10-Year Built-In Battery | 10-Year Built-In Battery | 9V Battery, Included | 120V Plug-In, Battery Backup | 9V Battery, Included | Hardwired, 9V Battery Backup | 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 reliable fire safety using the Rely Essentials 5500 smoke detector with a 10-year sealed lithium battery. Designed for dependable early warning, this compact smoke alarm uses advanced photoelectric sensing technology to detect slow, smoldering fires more effectively while helping reduce nuisance alarms caused by cooking smoke or steam. Its compact 4-inch profile blends easily into bedrooms, hallways, living rooms, apartments, and other residential spaces where a discreet but powerful smoke detector is needed. The battery-operated design allows for quick and flexible installation without wiring, making it ideal for homeowners, landlords, property managers, and apartment units. A large Test/Hush button lets you easily test the smoke alarm or temporarily silence nuisance alerts, while the LED indicator provides clear status updates so you know the device is operating properly. When smoke is detected, the loud 85 dB alarm sounds immediately to help alert occupants and support a faster response. Built to meet UL 217 9th Edition smoke alarm standards, the Rely 5500 ensures constant 24/7 security for your home.
More Rely Products
Rely Essentials 5500 | Rely RealAlerts 7500 | Rely Essentials 4500 | Rely Essentials 6200 | Rely Essentials 5300 | Rely Essentials 5400 | Rely Essentials 5600 |
|---|---|---|---|---|---|---|
| Customer Reviews | ||||||
— | — | — | — | — | — | — |
| Price | ||||||
| — | — | — | — | — | — | — |
| Detection Type | ||||||
| Smoke | Smoke | Smoke | Carbon Monoxide | Smoke & Carbon Monoxide | Smoke | Smoke & Carbon Monoxide |
| Size | ||||||
| 4” Diameter | 6" Diameter | 4” Diameter | 6”H x 2”W | 6” Diameter | 6” Diameter | 6” Diameter |
| Power Source | ||||||
| 10-Year Built-In Battery | 10-Year Built-In Battery | 9V Battery, Included | 120V Plug-In, Battery Backup | 9V Battery, Included | Hardwired, 9V Battery Backup | 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 |