Features 1、MEASUREMENT DATA: This is a carbon dioxide meter with a excellent chip, which accurately tests carbon dioxide(CO2), temperature and humidity in real time on its display 2、AUTOMATIC BUZZER: The CO2 detector has a three color symbol to visually display CO2 levels. When the CO2 concentration reaches the reminding value, a buzzer sound will be triggered 3、RECHARGEABLE BATTERY: Micro USB interface charging interface, 1600mAh large capacity battery, you can use the CO2 detector for a long time without frequently changing the battery. Charging the CO2 detector for 2 hours ensures 24 hours of use 4、ADJUSTABLE BRIGHTNESS: You can also adjust the brightness of the indoor air quality detector display to protect your eyes in different light 5、SMALL AND EXQUISITE: The air quality tester has a small and exquisite body design, which is easy to carry around. Whether is in your pocket, backpack, or car, you can check anytime, anywhere. Whether traveling, on business or in a newly renovated house, can be your air quality guardian and protect your health Specification Item Type: CO2 Detector CO2 Detection Range: 400-5000 ppm Temperature Range: 14℉-122℉(approx. -10℃-50℃) Humidity Range: 20%-85% RH Sampling Time: 1.5 Seconds Battery: 1 x 1600mah rechargeable lithium battery Package List 1 x Main Unit 1 x User Manual 1 x USB Cable