The First Alert Smoke Alarm SM310 is a dual sensor detector that combines ionization and photoelectric sensing technologies to provide comprehensive smoke detection. The ionization sensor is responsive to fast-flaming fires, while the photoelectric sensor effectively detects slow-smoldering fires, offering broad coverage for various fire scenarios. This unit features a sealed 10-year lithium battery that powers the device for its entire lifespan, eliminating the need for battery replacements and reducing maintenance tasks. The integrated battery ensures uninterrupted protection even during power outages, as the alarm draws power solely from the internal cell.

The alarm is constructed with a durable ABS plastic housing, designed to withstand typical household conditions while maintaining reliable performance. A large test/silence button allows users to verify functionality or temporarily silence nuisance alarms, such as those caused by cooking or steam. When the sensor detects smoke, the unit emits a loud 85-decibel alarm pattern to alert occupants. At the end of the battery’s service life, the alarm chirps intermittently as a low-battery warning, signaling it is time to replace the entire unit.

The sealed design also prevents tampering or battery removal, ensuring compliance with safety recommendations for long-term installations. This detector meets UL standards for smoke alarms, providing dependable protection for bedrooms, hallways, and living areas. The SM310 is suitable for homes, apartments, and small businesses seeking an affordable yet effective safety device. Its straightforward installation includes a mounting bracket that attaches to standard junction boxes or wall surfaces, requiring only basic tools.

The unit’s low-profile design blends into ceilings, with a neutral white finish that suits most interiors. Given its 10-year sealed battery, users can rely on consistent performance without annual battery swaps, making it a low-maintenance choice for busy households. Priced at an accessible level, this smoke alarm offers great value for entry-level fire safety equipment. The dual sensor technology provides a balanced approach to detection, reducing false alarms while improving response times across different fire types.

The fixed lifespan also simplifies replacement scheduling: after a decade, the entire unit is swapped out, ensuring sensors remain effective without degradation. While no smoke alarm can guarantee complete protection, the SM310 delivers reliable performance for residential environments when installed according to guidelines. In summary, the First Alert SM310 is a practical dual sensor smoke detector with a sealed 10-year battery, test/silence button, and robust build quality. It prioritizes convenience and affordability without sacrificing essential detection capabilities, making it a sensible option for budget-conscious buyers seeking dependable fire safety for their premises.