Where to buy the best co detector and smoke? 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-COPE-I AC Wire-in Combo CO/Photo Smoke Alarm (21007624) (Click Link to Check Price on Amazon)
Editor's Rating : 9.1 out of 10
AC-Wire with battery backup, An included 9V battery protects during short-term power outagesFront-loading battery with unique battery door design

3. First Alert BRK SC-9120B Hardwire Combination Smoke/Carbon Monoxide Alarm with Battery Backup (Click Link to Check Price on Amazon)
Editor's Rating : 9.9 out of 10
Superior combination carbon monoxide sensor and ionization smoke alarm (this model is SC9180B combination smoke and CO alarm)Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms

4. First Alert PRC710 10-Year Combination Carbon Monoxide and Photoelectric Smoke Detector (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
Combination Photoelectric Smoke & Electrochemical Carbon Monoxide Sensors Detect Deadly Smoke, Fire & Co HazardsPatented Smoke Entry System Allows For A Direct Path To The Photoelectric Smoke Sensor

5. Kidde P3010K-CO Worry-Free Kitchen Photoelectric Smoke and Carbon Monoxide Alarm with 10 Year Sealed Battery (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
Sealed-in 10-year lithium batteryCombination smoke and carbon monoxide alarm