The Firex 480 is a photoelectric smoke alarms. These units have an 85 decibel horn test switch and lighted power-alarm LED indicators.
This unit requires a 9V DC Battery and has a green lighted LED that "blinks" once per minute to confirm DC power and once per second in alarm. It also includes a 30 day low battery indicator and tamper resistant locking device.
These 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.