4-Pack Smoke and Carbon Monoxide Detector, 2 in 1 CO & Smoke Alarm, Carbon Monoxide Detectors with 10 Year Life, Digital Display, Battery-Operated Smoke Carbon Monoxide Alarm(No Battery) - Shenzhen Cordier Electronics Limited, CDR-803

• 2-in-1 protection-- Carbon monoxide detectors use dual optical and electrochemical sensors to detect smoke and carbon monoxide. Light spot sensor detects smoke, high sensitivity sensing carbon monoxide, to a great extent to avoid the occurrence of false alarms. Electrochemical techniques warn of the dangers of carbon monoxide. An alarm clock with a sound greater than 85 decibels alerts you when danger is detected. LCD Display & Indicator--Battery-operated smoke detectors are equipped with a large LCD that displays the concentration value of carbon monoxide in the air in real-time. If there is carbon monoxide or smoke, the green light will blink every 30 seconds. When the battery is running out, the red light will flash continuously for some time until all the power is used up. Comprehensive protection--The vent carbon monoxide enters the induction chamber through the gap between the alarm shell and the bottom shell, and the 360° air intake ring ensures completely accurate detection without blind spots. Ensure 24-hour monitoring of the entire home by placing a smoke alarm and carbon monoxide detector on every floor of the home, bedrooms, habitable parts of the basement and attic, and more. Easy to Install--Smoke Carbon Monoxide Alarm comes with a mounting bracket and screws, easy to install. 9V battery powered（battery not include）, easy to replace. Press the "Test" button weekly to test the alarm. And reset the carbon monoxide detector. Long service life--Smoke, carbon monoxide combination alarm in line with UL217, UL2034 standards. We are committed to providing quality products and the best customer service, it is environmentally friendly and time-saving, and also has a long life. Protect your home and family with smoke alarms!, Manufacturer: Shenzhen Cordier Electronics Limited