Indoor carbon dioxide meter, carbon dioxide detector, air quality mon with NDIR sensor, 1600mAh , USB charging, alarm function, silent mode for home/office/gym/warehouse air detection Clear LCD screen--- air quality mon adopts hollow design, color LCD screen digital display, clear digital mon ing carbon dioxide concentration, temperature and humidity, easy to identify and read. With backlit design, it is still clear in the dark. 1600mAh Rechargeable --- The air quality mon uses a built-in 1600mAh , which can be used continuously for 4-7 hours after being fully charged in 3 hours. It can meet your mon ing needs. -time Mon ing--- The mini capnometer adopts high-precision NDIR sensor technology to detect carbon dioxide, temperature and humidity accurately and quickly. Place the air quality detector CO2 in a ventilated place, turn it on, and the automatic calibration is completed after 1-2 minutes, and the CO2 detector can be used normally. AUDIO ALERT AND SILENT MODE--- An alarm will be ed when the carbon dioxide exceeds 1000 ppm and remind you of the air quality. you and your need a deep sleep, you can set the air meter to silent mode to ensure a quiet environment. Wide application--- carbon dioxide detector is small in size and easy to carry. Ideal for home interiors such as living rooms, manufacturer warehouses, gyms, classrooms, offices and enclosed spaces. Especially suitable for places with children and pregnant women.