CO250B Basic Battery Operated Carbon Monoxide Alarm


CO250B Basic Battery Operated Carbon Monoxide Alarm



Help protect your home or facility against the threat of carbon monoxide leaks with the CO250 Battery Operated Carbon Monoxide Alarm. Equipped with an electrochemical carbon monoxide sensor, a test button, an 85-decibel alarm, and a red LED power indicator, this battery-operated CO detector warns you of the presence of carbon monoxide.

  • Includes a 9-volt battery and all necessary mounting hardware
  • Electrochemical CO sensor
  • Silence options can temporarily silence both alarm and low-battery chirp
  • Convenient end-of-life chirping signal
  • Alarm cover locking pin helps prevent tampering and battery removal
Product Overview


Electrochemical Sensor Detects CO

The First Alert CO250B Battery-Operated Carbon Monoxide Alarm uses an advanced electrochemical CO sensor to detect elevated carbon monoxide levels from a variety of sources, such as faulty fuel-burning appliances, blocked chimneys, and cars left running in the garage. When CO is detected, the carbon monoxide detector sounds a loud 85-decibel alarm to warn you of the threat. Carbon monoxide can’t be seen, smelled, or tasted in the air and is the leading cause of accidental poisoning deaths in America. By placing carbon monoxide detectors on every floor of your home and in each sleeping room, you can help protect your family from the danger of CO.

Two Silence Settings

The CO250B battery-operated carbon monoxide alarm features two silence options. The low-battery chirp can be silenced for up to eight hours, and the CO alarm itself can be silenced for several minutes.

Safe Detection for Residential and Commercial Spaces

An electrochemical sensor provides early carbon monoxide warning in homes, apartments, hotels, hospitals, and other spaces. An easy-to-use mounting bracket allows you to mount the battery-operated alarm to a wall or ceiling.

Convenient Battery Operation

The CO alarm uses a 9-volt battery for operation, helping provide continuous protection in the event of a power outage. The alarm is programmed to chirp about once a minute when the battery life gets low and includes a tamper-resistant battery cover locking pin to help prevent undesired battery removal.

Slim Design Matches Any Décor

With a sleek, low-profile design, this battery-operated carbon monoxide alarm detector complements most décor. The classic white casing easily blends in with walls and ceilings.

Works With...


View All
Getting Started

Get Started

Professional installations gets professional results. Find an authorized professional near you to complete your installation.

Product Manuals

Document Resource Icon

User Manual for CO250 Carbon Monoxide Alarm (English, Spanish)