This 11-in-1 indoor air quality monitor uses a combination of an NDIR infrared CO2 sensor, laser particle sensor, semiconductor sensor, photoelectric sensor, and a temperature/humidity sensor to deliver fast, accurate readings. It tracks AQI, CO2, PM1.0, PM2.5, PM10, particles, HCHO, TVOC, temperature, and humidity in real time on a clear LCD screen with adjustable brightness. Each reading is paired with a color-coded alert system (green/yellow/orange/red) plus an audible ticking alarm and flashing indicator when air quality drops outside the normal range, so problems are easy to spot at a glance. It’s powered by a 2500mAh battery with Type-C charging, offering up to 11-12 hours of continuous monitoring on a single charge.

Condition Notes: This unit is Open Box; The retail packaging has been opened, but the monitor itself shows no visible damage or wear and powers on and reads normally.

This item was opened and inspected prior to listing to confirm it functions properly and all parts are included.