Features: The Air Quality Monitor utilizes a semiconductor TVOC sensor for rapid detection, ensuring you get quick. This Portable CO2 Detector features a premium electrochemical detection module, making it a reliable air quality testing device for both home and professional use. The Carbon Dioxide TVOC HCHO Detector offers excellent accuracy and stable performance with strong anti-interference capabilities, providing you with dependable data. Designed for low power consumption and long service life, the PM2.5 PM10 HCHO TVOC CO2 CO Meter is friendly, ensuring use over time. The AQI Tester features a large screen that displays six key metrics, including air quality index, battery life, and air quality levels, offering a complete overview at a glance. Specifications: Gas Type: Multifunctional With LCD Screen Or Not: Yes Built-in lithium battery: 1200mAh Rated voltage: 3.7V Charging time: 2-3 hours Usable time: 240-360 minutes Shell material: ABS Package Included: 1 X Air Quality Detector 1 X Instruction Manual 1 X Data Cable SPETLEK Air Quality Monitor CO2 Meter CO HCHO TVOC PM2.5/10 Detector