16-in-1 Air Quality Monitor with 7AQI Beep Alarm, CO2, PM 1.0-10,HCHO,TVOC - New Open Box PRODUCT DETAILS: Item: 16-in-1 Air Quality Monitor with 7AQI Beep Alarm, CO2, PM 1.0-10,HCHO,TVOC Size: 4.3x3.54x1.69 in Color: white 16 IN 1 MULTIFUNCTIONAL AIR QUALITY METER: 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. BUZZER ALARM: The air quality monitor built-in "BBB..." buzzer will trigger an alarm whenever any air quality level reaches a dangerous threshold, promptly alerting you to current air conditions. Once activated, the buzzer can be manually turned off to ensure it doesn?t disturb your rest time BATTERY-POWERED: Up to 8 hours of continuous use. USB interface with a built-in high-capacity lithium battery, so you don?t need to keep it plugged in. It?s portable and easy to move, perfect for use at home or in the office Item is new open box - inner packaging a bit broken and no user manual Thank you for your interest! Please check out our see other items page and save our seller page for easy future shopping with us. Please ask any questions you may have before purchasing. Thank you, we truly appreciate your business!