Item Type: Carbon Dioxide DetectorMaterial: ABS and electronic componentsGross Weight: 380g/13.4ozProduct Size: 16x9.2CM/6.3x3.6inCarbon Dioxide Detection Range: 400 to 5000ppm Accuracy: 1ppmHCHO Detection Range: 0 to 0.6mg/M3TVOC Detection Range: 0 to 2.0mg/M3Temperature Measurement Range: 1 to 70 Accuracy: 1Humidity Measurement Range: 0 percents to 99 percents RH Accuracy: 2 percentsBattery: Built in rechargeable lithium battery, model: 18650, Capacity: 1200mAh, delivered with built in battery 1TVOC Sensor: Our carbon dioxide detector, using semiconductor TVOC sensor, has good accuracy, stable performance, strong anti interference ability, low consumption, and long service life. 2Large Screen: The large screen of the carbon dioxide detector displays power, CO2, temperature and humidity, so you can check the air quality at any time. 3Different Font Colors: This carbon dioxide detector use different font colors to show different air quality, 400 to 800ppm: green is normal, 800 to 1800ppm: yellow concentration is slightly higher, more than 1800ppm: red concentration is super high. 4Rear Vents: The rear vents not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 5Widely Applicable: Our carbon dioxide detector is widely applicable for schools, hospitals, restaurants, shopping malls, offices, etc.