Features: 1.Professional Design: Necklace purifier with double negative ion head, with timer protection mode, energy saving and environmental protection, lasting air purification. 2.Compact And Portable: This portable purifier has an adjustable length lanyard, simple shape, mini portable, free to breathe clean air wherever and whenever. 3.Quiet: The necklace air purifier provides quiet and noiseless work, operating decibel is not higher than 18dB, quietly let you feel no movement. 4.Frosted Process: Wearable air purifier surface special frosted process processing, comfortable to the touch, more fashionable, will not affect your shape. 5.Use Scenario: Mini portable purifier, can be used to remove smoke and odor, and can be used in the bedroom, car, office and other places. Specification: Item Type: Necklace Purifier_x005f_x000D_ Material: ABS_x005f_x000D_ Battery Type: Lithium Battery