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. 2. Smart wireless WiFi air quality monitor: long 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. 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, get to know the air quality around you. 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 always of you and your family's health. 5. Smart air quality monitor:Gas Detector can help us detect homes, offices, schools, hotels, hospitals, laboratories, and anywhere with high levels of carbon dioxide and formaldehyde., Manufacturer: Hundnsney