This is an air quality detector that can accurately measure Co2 concentration, temperature, humidity, and effectively protect the breathing health of you and your family. Features: 1. Ndir sensor and infrared detection technology: The product uses high-performance Ndir sensor and infrared detection technology, with accurate detection, high precision, 1s / time real-time refresh, and accurate positioning of air quality. 2. 3-in 1 function: The air quality detector is small and portable, and can accurately measure Co2 concentration, temperature and humidity. 3. Easy to use: Press and hold the power button for 3 seconds to turn on or off, and the surrounding environment can be automatically detected after turning on. Press the power switch twice to switch between C and F. 4. Large-capacity battery: 1200mAh large-capacity battery, low power consumption, long-lasting battery life, using Type-c charging interface. 5. Zinc alloy shell: The shell is made of zinc alloy material, and the simple and rounded frame is matched with a large display screen, which elegantly integrates into various home styles. 6. Applicable occasions: The detector is mainly used in living rooms, schools, hospitals, gyms, cinemas, offices, breeding greenhouses and other places. Note: 1. Due to manual measurement, there will be a 1-2 mm error in the size. Thanks for your understanding. 2. Due to different light conditions and different monitors, item color displayed in photos may be showing slightly different from real object. Specifications: Color: Black / Silver ( Optional ) Material: Zinc Alloy + ABS + Electronic Components Display: Led Co2 Measurement Method: Ndir Infrared Sensor Co2 Measurement Range: 400-5000 Ppm Co2 Measurement Sensitivity: 1Ppm Co2 Measurement Concentration Error Value: 5% 50Ppm Temperature Measurement Range: 0~50 Temperature Measurement Accuracy: 1 Humidity Measurement Range: 0-99.9%RH Humidity Measurement Accuracy: 5%RH Charging Method: USB-Type C 5V/1A Lithium Battery Capacity: 1200mA Environment Temperature: -10~45 Working Voltage: 3.7V Response Time: 60S Maximum Power Consumption: 500mA Item Size: 8*7.5*3.3cm / 3.15*2.95*1.30in (L*W*H) Net Weight: 265g / 9.35oz Instruction Manual Languages: Chinese + German + Italian + French + English + Japanese + Spanish + Portuguese Package List: 1 * Tester ( Built-in Lithium Battery ) 1 * USB Charging Cable 1 * Instruction Manual ( 8 Languages )