Package Included: - 1 x Set of Air Quality Monitor. Usually it cost about 35USD-50USD. If you receive defective item, please kindly notify us within 14 days. The item "DM69 Air Quality Monitor CO2 PM2.5 HCHO TVOC Temperature Humidity Detector" is in sale since Friday, March 19, 2021.This item is in the category "Business & Industrial\Test, Measurement & Inspection\Test Meters & Detectors\Other Test Meters & Detectors". The seller is "supmotor" and is located in Shenzhen. This item can be shipped worldwide.