Features:  1. Low power consumption: unique low power consumption design, low power reminder function. 2. LED blue backlight display screen: When the concentration of carbon monoxide exceeds the standard, it will be accurately displayed on the screen. 3. Sound and light alarm: through the air inlet detection, when the concentration reaches the value, it will automatically emit a sound and warning light. 4. High-sensitivity sensing: This product has high-sensitivity sensing and high-precision chips to avoid interference from other gases.   Description:  When the alarm detects the leakage of carbon monoxide, the screen will display the current value according to the gas concentration, and will automatically alarm when the alarm value is reached.   Specifications:  Power supply: 2*AAA batteries Working range: temperature 4-38℃ Alarm sound: 85DB (3 m) Alarm current: <80mA Quiescent current: <40uA Low battery alarm: a beep every 30 seconds Product size: diameter 62mm*62mm*28mm Sensor: Electrochemistry   Package Included:  1 set * Carbon monoxide alarm   Notes:  1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures. 2. Please allow slight dimension difference due to different manual measurement.