FIRST ALERT CO250 Carbon Monoxide Alarm — Battery-Operated Detector with 9V Battery & Two Silence Features

Safe, proactive carbon monoxide monitoring for homes and multi-unit spaces

The FIRST ALERT CO250 is a compact, battery-operated carbon monoxide alarm designed for residential and institutional settings. It provides early warning, helping you stay aware of potential CO presence in living areas, sleeping rooms, apartments, dorms, hotels, motels, and other multifamily environments. This model adheres to key safety standards and building codes, including UL2034, NFPA 720, and NFPA 101, making it a practical choice for spaces that require reliable CO detection with silence options.

Built to be discreet yet dependable, the CO250 features an electrochemical CO sensor, a clearly audible 85 dB horn, and a red LED that indicates either power or alarm status. The device is offered in two battery configurations: the CO250B with a 9V alkaline battery and the CO250LB with a 9V long-life lithium battery. This ensures continued protection even in places where frequent battery changes aren’t convenient. The alarm is designed for wall or ceiling mounting, with a hinged cover that allows battery access without removing the unit from its mount.

Key benefits at a glance

• Electrochemical CO sensor delivers reliable detection with a fast response
• Audible 85 dB horn to alert occupants across rooms and hallways
• Red LED indicator signals power and alarm status for quick verification
• Two silence features for practical control: low battery silence and alarm silence
• Tamper-resistant locking pin protects against battery removal
• Includes mounting hardware and supports easy wall or ceiling installation
• Two battery options help fit different maintenance needs

Ease of installation and ongoing maintenance

• Compact, low-profile design blends with any decor
• Hinged cover enables battery changes without removing the unit
• Chirp alerts when battery replacement is needed, with a protective cover design that avoids accidental closures
• End-of-life chirp provides a clear maintenance cue

Who benefits from the CO250

Ideal for environments that prioritize occupant safety in shared spaces, including apartments, dormitories, hotels, motels, and hospital sleeping rooms. The unit’s compliance with established standards helps align with codes used in multifamily dwellings and institutional buildings.

In everyday use, the CO250 offers practical, non-intrusive monitoring. It helps occupants notice potential CO presence early, enabling timely action. While not a medical device, it provides a proactive safety layer for spaces where multiple people share air and sleep—supporting informed decisions about ventilation and maintenance.