Homlly Portable Air Purifier Ionizer Wearable NecklaceIonic air purifier releases more than three million negative air purified by ions to remove contaminants from your personal space. Effectively purify dirty and harmful substances (such as pollen, dust), used smoke and bacteria, mold, formaldehyde and even PM2. 5 air pollutants Negative ions promote metabolism, activate cells, refresh and relieve motion sickness. Simple and compact allow easy hung around the neck or hung in the car. Low sound during