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Push and hold the Test/Silence button on the cover until you hear an acknowledge “chirp”. The alarm horn will sound 4 beeps, a pause, then beeps. The ALARM (RED) Product: Carbon Monoxide Alarm, Size: 215 KB, Number of Pages:. View and Download First. Alert CO400 user manual online. First Alert Battery Operated Carbon 4 beeps), simulating a CO Alarm condition. BATTERY OPERATED CARBON MONOXIDE ALARM. WITH SILENCE FEATURE. USER'S MANUAL. Model. CO400. This user's manual contains important information about your Carbon. Monoxide (CO) Alarm's operation. If you are installing this CO Alarm for use by others, you This First Alert battery-operated carbon monoxide alarm is easy to use and provides continuous protection, even during power outages. Order now! View and Download First Alert CO400 user manual online. BATTERY OPERATED CARBON MONOXIDE ALARM WITH SILENCE FEATURE. CO400 carbon monoxide alarm pdf manual BA TTER Y OPERA TED CARBON MONOXIDE ALARM WITH SILENCE FEA TURE USER'S MANUAL Model CO400 Printed in Mexico M08-0140-004 P 06/07 IMPOR T ANT! PLEASE READow battery warning. Install 1 new 9 volt battery*. INSTALLATION. WHERE TO INSTALL CO ALARMS. T. he National Fir IMPORTANT! PLEASE READ CAREFULLY AND SAVE. This user's manual contains important information about your Carbon. Monoxide (CO) Alarm's operation. If you