The LG PuriCare Wearable Air Purifier's battery-powered face mask works similarly to the company's home air purifiers by using two H13 HEPA filters. This design provides you with fresh, clean air – whether you are indoors or outdoors. The LG PuriCare portable air purifier also has two fans and a patented breathing sensor to filter out unclean air. It also detects the volume of your breath and adjusts the speed of the fan accordingly. In particular, the fans are automatically enlarged to support the intake of air. Or they decrease the resistance on the exhale to make breathing effortless. Most impressive is that the UV LED lights kill harmful germs to keep you healthy. It's ergonomically designed and fits snugly to minimize air leakage. It's also comfortable to wear for hours. In fact, the battery has an operating time of up to eight hours.