[5-in-1 Indoor Air Quality Monitor]Our air quality meter can accurately evaluate 5 air quality parameters at the same time. These include concentrations of carbon dioxide (CO2), formaldehyde (HCHO), natural and synthetic volatile organic compounds (TVOCs), temperature (°C/°F) and humidity (%). [Shorter Measuring Time ()]Based on the old air quality monitor, we use a more powerful sensor chip, shortening the measuring time to . And this indoor air quality tester provides a more accurate and consistent assessment of air quality parameters [Real-time Monitoring and Buzzer Alarm]After of testing time, the air quality detector monitor update the measurement data in real time. When "poor" air quality levels are reached, the alarm goes off. [Air quality level indication] There be level indications below the measurement data (CO2, HCHO, TVOC), divided into GOOD (safe), OK (need attention), and POOR (dangerous). When the air quality level reaches the "POOR" level, the alarm sound. Note: The indication of the air quality level is for reference only, if you think it is safe under the current air quality parameters, you can ignore it. [Built-in 3.7V lithium battery]There is a power indicator light on the screen of the indoor air quality monitor. When the battery power is too low, the battery symbol box is empty, indicating that the power is about to run out, please charge it in time. Colour:orange Material:plastic Package Contents: 1 x Air Quality Monitor Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.