Rechargeable Indoor Air Quality Monitor (Model: AK23) by Xoopon

List: $139.99. On sale on Amazon for $109Unused but not in original box so Like new. USB charging cable included. 16-in-1 Air Quality Monitor Indoor w/7AQI Beep Alarm, CO2 Monitor, Air Quality Detector w/PM1.0-PM2.5-PM10-Temp-HUM-Formaldehyde-VOC Tester for Home Office Plant (Black)This air quality monitor measures not only 7X AQI, but also temperature, humidity, formaldehyde (HCHO), volatile organic compounds(VOC), PM1.0, PM2.5, and PM10. It combines multiple functions to comprehensively monitor various air quality parameters, resampling every 1.5 seconds to provide real-time data and continuously protect your every breath.Built-in buzzer will trigger an alarm whenever any air quality level reaches a dangerous threshold, promptly alerting you to current air conditions.Up to 8 hours of continuous use. USB interface with a built-in rechargeable high-capacity lithium battery, so you don’t need to keep it plugged in. Lightweight/compact (109x90x43 mm), faultless for on-the-go use. Perfect for everyday use. first-class materials and excellent craftsmanship ensure long-lasting durability.