【Convenient Hanging-Neck Design】The portable hanging-negative ions purify air machine features a convenient hanging-neck design, allowing it to be carried around easily. Its small size enables it to purify the breathing air anytime. 【Effective-Odor and Impurities Removal】This purifying device effectively removes-odors and impurities from the surrounding air. It is a great-gift for friends, kids, and family, suitable for a group of people. 【Cartridge-Free】No need to replace cartridges, saving you excessive consumption. With a 20+ million negative ions air purification principle, it gathers negative ions to precipitate impurities, while anions decompose peculiar smells and particles. It also adsorbs PM5 particles for degradation. 【Safe and Radiation-Free】The negative ions emitted by this device purify the air without any sharp-angles or radiation. It is suitable for children, the elderly, and pregnant women, providing them with a 0 radiation environment for a fresh and comfortable life. Its quiet operation ensures peaceful sleep. 【Long Battery Life and Easy Charging】Equipped with a 700mAh capacity battery, this hanging-negative ions purify air machine offers a long battery life. It can be fully charged within minutes and used continuously for hours. The USB interface provides convenient charging.