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BRK SA350B features a dual ionization smoke sensing chamber, an 85 dB horn,
a sealed 10-year lithium power cell power supply that is permanently installed, a
single button for test/silence and a red LED that blinks to indicate unit is receiving
power. The tamperproof design will not allow the powercell to be removed. The
low power warning indicator will cause the alarm to “chirp” when it reaches the
end of its service life and needs to be replaced. Upon end of life, the unit meets
UL requirements for disabling the alarm and non-reinstallation of unit to mounting
bracket. Designed for surface mounting, the SA350B includes mounting anchors
and screws. Includes a gasketless base for easy installation and a new mounting
bracket that keeps the alarm secure over a wide rotation range to allow for perfect
alignment.
Alarm Dimensions: 5.6” dia x 2.0”H
Weight: 6.9 oz
Operating
Voltage: 9V (three 3V) Lithium Power Cells
Temperature Range: 40°F (4°C) to 100°F (38°C)
Humidity Range: 10% to 95% relative humidity (RH)
Audio Alarm: 85dB at 10 feet
Test/Silence: Electronically simulates smoke condition, causing the
unit to alarm. Press and hold test/silence button.
Alarm Reset: Automatic when smoke clears
Smoke
Sensor: Dual Ionization
Indicator
Lights/Sounds:
DC Power: Intermittent Red LED
Local
Alarm: Audio alarm and rapidly flashing Red LED
Listing: Listed to UL217 Standard
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Nice experience 
