1、Professional infrared sensor module has high accuracy, stable performance, strong anti interference ability, low energy consumption, and provides long term use. 2、Household carbon dioxide tester, with large screen display, which can directly display power, carbon dioxide, temperature and humidity. 3、Different font colors show different air quality, green means no more than good air quality, blue means moderately surpasses good light and moderate pollution, and red means more serious than good air quality. 4、There are 324 vents on the back to accelerate the convection between the air and the machine, get effective detection, and provide good heat radiation effect. 5、Small size, light weight, built in 2500mAh high capacity lithium battery, convenient for USB data cable charging, and accurate carbon dioxide detection. Item Type: Carbon Dioxide Detector Material: ABS Weight: Approx. 227g / 8oz Voltage: 5V Current: 1A Test Temperature: 20-40℃ Test Humidity: 20-90%RH Induction Time: <1s Battery: Polymer Lithium Battery 2500mAh (Included) Charging Time: 60min Product Size: Approx. 11.9x6.2x2.6cm / 4.7x2.4x1.0in 1 x Carbon Dioxide Detector 1 x USB Cable 1 x Manual