[5-IN-1 Multifunctional Air Quality Monitor] The air quality monitor adopts high-precision and professional sensors, which can accurately detect formaldehyde (HCHO), volatile organic compounds (TVOC), carbon dioxide (CO2), temperature, and humidity, allowing you to fully understand the indoor air condition. This portable indoor air quality monitor helps detect air quality in homes, kitchens, bedrooms, schools, offices, cars, hotels, and more.[Accurate Measurement & Vent Design] The CO2 monitor has a built-in advanced digital sensor with fast response speed and high sensitivity. The internal high-performance chip quickly processes sensor data and calculates gas concentrations in complex environments, delivering accurate results. The innovative vent design ensures full contact between air and the sensor, enhancing measurement accuracy.[HD Screen with Backlight] The air quality monitor features a high-definition LCD screen with blue backlighting. Data is clearly displayed and easy to read, enabling you to instantly assess air quality.[Buzzer Alarm] When air pollution levels are too high, the indoor air quality monitor displays 'POOR' and automatically sounds an alarm via the built-in buzzer to alert you.[Highlight Maximum Value & 120 Seconds Countdown] The CO2 detector includes a MAX button to review the highest recorded value in the current test session after power-on or calibration. Upon startup, the device counts down 120 seconds before entering test mode. During this period, place the air quality meter in a well-ventilated area to ensure accurate readings.[Ultra-Long Standby Time] Built-in 1000mAh rechargeable battery provides 6 to 7 hours of continuous operation when fully charged.Color: As Shown Material: ABS Size: 164x70x32mm Package Contents: 1 x Air Quality Monitor 1 x USB Type-C Cable 1 x English Manual Note: Light reflection and differences in display screens may cause slight variations between the color of the item in the image and the actual product. Measurement error allowance is +/- 1-3cm.