Most Popular co sensor alarm on Amazon to Buy (Review 2017)

1. Kidde Battery-Operated Combination Smoke/Carbon Monoxide Alarm with Voice Warning KN-COSM-BA (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Smart 2-in-1 Voice Alarm - Voice announces "Fire!" or "Warning! Carbon Monoxide"Smart Hush - Nuisance alarms are silenced by pressing the hush button.

2. Kidde KN-COPP-3 Nighthawk Plug-In Carbon Monoxide Alarm with Battery Backup (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Digital display displays the level of carbon monoxide the unit is sensingPeak Level Button -Displays the peak CO level recorded by the alarm since it was last reset or unplugged

3. Nest Protect Smoke & Carbon Monoxide Alarm, Battery (2nd gen) (Click Link to Check Price on Amazon)
Editor's Rating : 9.8 out of 10
Know from anywhere. Connect Nest Protect to Wi-Fi and it will send an alert to your phone if the alarm goes off or the batteries run low.Tells you what and where. It speaks up to tell you if there's smoke or CO and where the problem is, so you know what to do.

4. Kidde P3010K-CO Battery-Operated Combination Carbon Monoxide and Smoke Alarm with Photoelectric Sensor (Click Link to Check Price on Amazon)
Editor's Rating : 9.3 out of 10
Combination smoke and carbon monoxide alarmSealed-in 10-year lithium battery

5. First Alert CO250T Travel CO Alarm with Travel Bag (Click Link to Check Price on Amazon)
Editor's Rating : 9.9 out of 10
Durable lightweight design for optimal portability with travel bagElectrochemical sensor is the most accurate technology available for detecting carbon monoxide