BRK Electronics First Alert CO400B 9V DC Battery Operated Electrochemical Carbon Monoxide (CO) Alarm

Basic battery operated carbon monoxide alarm meets most codes, both state and local, for carbon monoxide alarms. Electrochemical Carbon Monoxide Sensor - the most accurate sensor available as compared to other sensing technologies Front-access battery compartment - allows easy battery replacement Single Button Test/Silence Two silence features - can silence the low-battery chirp for up to eight hours or temporarily silence an unwanted nuisance alarm End of Life Signal provides audible notification alarms needs to be replaced 7-Years Limited Warranty Model # CO400B Weight 5.5 oz Dimension 3.3"H x 4.8"L x 1.5"D Operating Voltage 9V Alkaline Battery Temperature Range 40°F (4°C) to 100°F (38°C) Humidity Range 10% to 90% relative humidity (RH) Audio Alarm 85dB at 10 feet Test/Silence Electronically simulates CO conditions, causing the unit to alarm or temporarily