X-Sense Smart Smoke & CO Detector
This smoke, CO detector features smoke photoelectric and CO electrochemical sensors. It detects CO levels of 70 ppm in 60-240 minutes, 150 ppm in 10-50 minutes, and 400 ppm in 4-15 minutes. The alarm emits 85 dB or higher at 10 ft with a 3.2 kHz pulsing sound. The price drops from $125.99 to $75.99. Shipping is free.