The Fist Alert SA3210 Dual Sensor Ten Year Alarm makes use of both ionization and photoelectric sensors to offer the earliest possible warning--regardless of the type of fire. Sometimes a fire can smolder for hours before erupting into flames. Photoelectric Sensing Technology is more sensitive than Ionization Sensing Technology at detecting these sorts of smoldering fires, like those caused by cigarettes burning in couches or bedding. Other fires erupt into flames quickly, like kitchen grease fires or fires fueled by paper burning in a wastebasket. Ionization Sensing Technology is generally slightly more sensitive than Photoelectric Sensing Technology at detecting these sorts of flaming fires.

This is a battery powered alarm - powered by a sealed, ten year lithium battery to provide continuous protection for ten years without battery replacement. Single test/silence button mutes unnecessary alarms and tests function. End of life timer sounds when it's time to replace your alarm. First Alert SA3210 meets UL217 standards and complies with legislative requirements for 10-year battery operated smoke alarms. This product includes mounting hardware and is backed by a 10 year limited warranty. (Meets California 10 Year Smoke Alarm Requirements.)

SUMMARY:
- Utilizes both ionization and photoelectric smoke sensors for optimal performance

- Intelligent sensing technology reduces non-emergency or nuisance alarms

- Powered by sealed, ten year lithium batteries to provide continuous protection for ten years without battery replacement

- Emits a loud 85 dB alarm for ample warning

- Meets UL217 standards and complies with legislative requirements for 10-year battery operated smoke alarms