REAL-TIME AIR QUALITY MEASURE - Monitor air quality with the touch of a button, measuring levels of Volatile Organic Compounds (VOC) and Particle Matter (PM2.5 & PM10). PORTABILITY - The pocket size makes it easy to carry, so you can measure quickly and easily anywhere indoors or outdoors. You can maximize portability through the bumper case included in the package. EASY TO USE - With the touch of a single button, air quality values are shown not only in numbers, but also in graph or icon mode. In addition, OLED is applied to secure high visibility. ADVANCED FAN - The built-in fan powerfully sucks in the surrounding air and shows changes in the air flow around you in real time. HIGH ACCURACY - The values measured by each dedicated sensor provide reliable air quality readings. In particular, CO2 measurement shows high accuracy by applying an NDIR sensor ( HI-150PRO only ) 100% Made in Korea: Developed and Produced by Humatech Huma-i skyblue (HI-120) is a portable personal air quality monitor with the highest quality in-house designed sensor modules for high accuracy readings. It measures fine & ultra-fine particulate matter in the air (PM2.5, PM10) and volatile organic compounds (VOC). Its user friendly ICON MODE means user don’t have to be familiar with fine dust levels, and its portability and design sensibility means you can carry it with you anywhere for the peace of mind you deserve.