11S Time Refresh: CO2 concentration is constantly changing and will fluctuate greatly under certain conditions. Rapid dectection can obtain more stable measurements 2One Button Switch Full Control: Long press the power button for 3 seconds to start or shut down. It can automatically detection. 3Detection More Accurate: Infrared detection technology, more accurate judgment of air quality problems. 4Real Time Monitoring: Real time display of carbon dioxide concentration per cubic meter, flashing display interval height. 5Detection at Any Time: Protect health, carbon monoxide detection range: 400-5000PPM. Item Type: Air Quality Monitor Material: ABS Input: 5V Sensor: Infrared Sensor Detection Range: 400-5000ppm Temperature Measurement Range :-10C~77C Humidity Measurement Range :0%~99%RH Display Mode: LED Digital Display + LCD + Backlight Built In Lithium Battery Capacity: 1200mAh(inclusive) 1 x Air Quality Monitor 1 x Cable 1 x Description