ZP07 air-quality module adopts flat surface semiconductor gas sensor. The module has good sensitivity to volatile organic gases such as formaldehyde, benzene, carbon monoxide, ammonia, hydrogen, alcohol and smoke of cigarette, essence &etc. The module has been aging, debugged, adjusted and calibrated. So it has good consistency and high sensitivity.FeaturesHigh sensitivityLow power consumption, long lifeCalibrated before shipmentColor: greenmaterial: plastic10 seconds to 3 minutes with auto-preheating functionFaulty auto-check, High cost-effectiveMain ApplicationsAir cleaner, fresh-air system, intelligent integrated ceiling, air quality detector, ventilator, air-condition.Package Contents:4 x Air-Quality Detection ModuleOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.