• Easy to Use Plug and play, saving time. Just plug it into a standard power outlet at home to start, carbon monoxide alarm accurately detects and instantly reacts to CO and combustible gas levels in the air, keep your family safe.
• How to test if the alarm is working 1.Plug in the power directly, the alarm will count down 180s warm-up.The green indicator is always on after preheating. 2.Press the"Self-test"button,the alarm will sound.At the same time,the green,red and yellow indicators light up,and the LCD displays"0". 3.Using lit cigarette gas to aim at the sensor position, when the device has a digital display or an audible and visual alarm, it means the carbon monoxide detector is working properly. <b>Notes：
• Notes： Do not install the alarm in dirty, greasy, or dusty places. Do not test at the exhaust or ventilation of a car, as excessive carbon monoxide emissions from the car exhaust can seriously affect the lifespan of the alarm.
• What is CO? Carbon monoxide is an colorless and odorless gas that can be produced by any fuel-burning appliance.CO at high concentrations, it can endanger human life.  <b>Vzmcov 4 in 1 Carbon monoxide detector will sound and light dual alarms when it detects a concentration exceeding the standard carbon monoxide concentration, which can quickly respond and ensure your and your family's safety.  

Shipping Note: Shipping to Alaska, Hawaii, PO Boxes, and APO addresses is not available for this item.

Warranty: 90 Day Woot Limited Warranty