120-Volt AC plug-in alarm Electrochemical carbon monoxide sensor Test/silence button85-decibel horn End-of-life timer Includes 5-year limited warranty. The First Alert CO600 Plug-In Carbon Monoxide Alarm is great for any standard outlet in your home. 1000 people are poisoned and 250 die every year from CO poisoning, but thanks to this device's accurate electrochemical sensor technology you'll be alerted to the danger you can't see, smell, or taste in the air. It also comes complete with a simple to use silence/test button, end-of-life timer, and an 85-decibel horn with mute function. The First Alert CO600 Plug-In Carbon Monoxide Alarm requires no mounting and is backed by a 5-year limited warranty. Additional Features Type: Plug-In Alarm Type: Carbon monoxide Use: Residential About First AlertWith a complete line of home safety devices, First Alert is America's most-recognized and most-trusted safety brand. Detectors, fire extinguishers, safety boxes, and other preparedness products give home and business owners alike increased peace of mind. First Alert is actively involved in the communities it protects, too, with longstanding outreach initiatives supporting fire service and other organizations dedicated to fire prevention, carbon monoxide detection, and safety.