Features 1、Carbon Dioxide Detecting: Intelligent carbon dioxide value tester gas analyzer uses air semiconductor TVOC sensor, monitoring temperature, humidity, carbon dioxide quality. 2、Air Quality Detecting: The air quality detector adopts a premium electrochemical detection module, which has good accuracy, stable performance, strong anti interference ability, low consumption and long service life. 3、Large Screen: Different font colors show different air quality, 0‑999ppm, green flash; 1000‑1999ppm, yellow flash; 2000‑2900ppm, orange flash; 3000‑3999ppm, red flash; 4000ppm, the above 4 colors flash. 4、Heat Dissipation: Hundreds of vents at the rear not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation. 5、Applicable Scenes: Indoor air quality monitor is suitable for offices, homes, gyms and other scenes, has a wide range of applications. Specifications Item Type: Carbon Dioxide Detector Material: ABS Weight: Approx. 234g / 8.3oz Screen Type: Segment Code Screen Screen Resolution: 240x240P Response Time: Less Than 1 Second Test Temperature Range: -10 ℃ to 50 ℃ Humidity Test Range: 0%-99% RH Working Voltage: 5V 1A Adapter Charging Maximum Power: Charging Current 500mA Battery: 3.7V Lithium Battery, 18650, 1200mAh (Shipped with Built in Battery) Charging Method: Type C Charging Cable Charging Time 2 Hours Alarm: When the carbon dioxide level reaches 1500, the alarm will sound 5 times Product Size: Approx. 9.2x7.2x4cm / 3.6x2.8x1.6in Package List 1 x Host 1 x Manual 1 x USB Cable