All smoke alarms should be replaced every 10 years.

The Firex 461 smoke alarm is an ionization 9V battery powered smoke alarms. This unit has an 85 decibel horn, test switch, low battery signal, and a lighted power/alarm LED indicator (except 461); the LED flashes once per minute indicating it is receiving power. When in alarm, the LED flashes rapidly once per second.hese Firex smoke alarms should be placed in single-family households or in each individual living unit of multiple-family buildings. All smoke alarms should be replaced every 10 years.

Features:
• Basic Protection
• Dual ionization smoke sensing chamber early detection of fast burning fires such as gasoline, cooking grease and paper
• Installation design and features similar to other Firex smoke alarms Contractor familiarity with installation
• Incorporates Firex installer-focused innovations Fastest and easiest installation available
• Factory sealed housing Prevents tampering and provides outstanding durability

Technical Specifications:
• Operating Temperature: 40°-100°F 4°-38°C
• Electrical Rating: 9V DC Battery Powered
• Alarm Point obs. 1.1±0.47%/ft.
• Horn Output: 85 decibels at 10 feet
• Listing: UL 217 and ULC S531
• Detection Type: Dual Ionization Chamber
• Humidity Range: 10%-93% Relative Humidity