1. 7-IN-1 Multifunctional: Professional CO2 meter features an advanced VOC sensor and recognition algorithm to accurately measure the data of PM2.5, TVOC, CO2, HCHO, temperature and humidity, time. low error, to know the air quality around you. 2. Smart wireless WiFi air quality monitor: long press for 5 seconds to configure WiFi can be connected to the Tuya APP, cell phones can remotely monitor the measurement results, more convenient and portable. 3. Rechargeable Battery: Air Quality Tester has a 1200mAn rechargeable lithium battery and is packed with a USB cable that can last up to 8 hours. you can charge the air quality monitor via power bank, power adapter, computer, PC, laptop. Built-in low power consumption processing chip can carry on long time uninterrupted monitoring to air quality. It will always of you and your family's health. 4. HD LCD backlit screen display:Digital PM2.5 tester With the LCD screen display and 24 hours real-time function, you can see the data more clearly at any time. 5. Smart air quality monitor: Detector can help us detect homes, offices, schools, hotels, hospitals, laboratories, and anywhere with high levels of carbon dioxide and formaldehyde. Charging Mode: USB(include) Battery: Built-in lithium battery 1200mAh :3.7V Power:0.4W NOTE: The VOC sensor is sensitive to gases, especially active gases such as alcohol, formaldehyde, vinegar, and , and is affected by this, causing changes in readings. Type: Air Quality Meter color:Black Material:ABS size:90 x 70 x 40mm Package Contents: 1 x Air Quality Detector 1 x Charging cable 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.