Features 1、3 in 1 air quality monitor, accurately detect the level of CO2, Temperature and Humidity. 2、Adopted high precision infrared sensor and high-performance chip, providing fast and reliable detection. 3、Easy to check the real-time data on the colorful LED display with large digits, fast capturing the results. 4、4 flashing indicator levels demonstrate different CO2 concentration, the alarm will be given out when value exceeding 1000PPM. 5、Built-in 2000mAh large capacity lithium battery, get rid of cable annoyance, flexible to use and charge. 6、Palm size with lightweight, perfect for home, school, office, hotel, warehouse and other environments. Specification Features: 3 in 1 air quality monitor, accurately detect the level of CO2, Temperature and Humidity. Adopted high precision infrared sensor and high-performance chip, providing fast and reliable detection. Easy to check the real-time data on the colorful LED display with large digits, fast capturing the results. 4 flashing indicator levels demonstrate different CO2 concentration, the alarm will be given out when value exceeding 1000PPM. Built-in 2000mAh large capacity lithium battery, get rid of cable annoyance, flexible to use and charge. Palm size with lightweight, perfect for home, school, office, hotel, warehouse and other environments. Specifications: Material: ABS Color: Black Voltage: DC5V Screen: Color LED Display CO2 Detection Method: Infrared (NDIR) CO2 Detector Range: 400-5000PPM Real Time Reading: 1S Alarm Sound: ＞1000PPM CO2 Indicator: 0-999PPM: Green Light Flash 1000-1999PPM: Yellow Light Flash 2000-2999PPM: Orange Light Flash 3000-3999PPM: Red Light Flash Above 4000PPM: 4 Lights Flash Battery: 1 * 3.7V Lithium Battery Item Size: 137 * 80 * 35mm / 5.4 * 3.1 * 1.4in Item Weight: 165g / 5.8oz Package List: 1 * Carbon Dioxide Detector 1 * USB Cable 1 * Manual Package List 1 * Carbon Dioxide Detector 1 * USB Cable 1 * Manual