You'll sleep sound in any hotel, motel, or dorm room with the First Alert CO250T Battery Operated Carbon Monoxide Travel Alarm with Bag. This lightweight, portable device uses an electrochemical sensor to detect carbon monoxide and sounds an 85 decibel horn when there's trouble. 1000 people are poisoned and 250 die from CO exposure every year but with this ETL listed device accompanying you on your travels you'll never have to worry about becoming a statistic. The First Alert CO250T Battery Operated Carbon Monoxide Travel Alarm is backed by a 7-year limited warranty and includes a 9-volt battery and convenient travel pouch. Additional Features Type: 9V long battery Alarm Type: Carbon monoxide Use: Residential About First Alert With 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. Carbon monoxide travel alarm. Electrochemical signal detects leaks. 85-decibel horn. Portable design with no installation required. Includes 9-volt battery and travel pouch.