Feature:  Manufacture of active oxygen:  Negative high-pressure ionized air is used to generate negative oxygen ions, which activates oxygen molecules in the air and makes them active and easily absorbed by the body. Prevention of air-conditioning diseases:  Negative ions decompose bacteria, smoke and dust, keep the air clean, eliminate fatigue, and can effectively prevent air conditioning diseases.  To promote metabolism:  Negative oxygen ions can activate various enzymes in the body and promote metabolism.  Enhance disease resistance:  Negative oxygen ions can change the reactivity of the body, activate the function of the reticuloendothelial system, and enhance the body's immunity.  Improve myocardial function:  Negative oxygen ions can invigorate people, improve work efficiency, improve sleep, and have obvious analgesic effects.  Sterilization function:  Negative ions are easy to adsorb bacteria, which produces structural changes and energy transfer, resulting in death of bacterial lesions and no longer generate new strains.  Reduce static radiation:  The "-" charge of negative ions is neutralized with the "+" charge of the display, reducing electrostatic radiation.     Specification:  Input Voltage: DC5V;  Maximum Power: <0.3W;  Body Size: 8.9×2.2 ×2.2cm/3.5x0.9x0.9in.     Package Included:  1 x USB Air Purifier.