3 Pack Bundle of Battery Operated CO Alarm with Backlit Digital Display, CO410
Amazon.com: Motteru Mini CO2 Detector with Alarm - Air Quality Monitor, Carbon Dioxide Detector Battery Powered with LED Digital Display and Sound Alert, Portable co2 Monitor, Air Quality Tester, CO Detector :
Li-ion Battery Operated Carbon Monoxide Alarm - China Co Detector, Li-ion Battery | Made-in-China.com