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USB Computer Ionizer to generate your own negative ion as a compensation as it produces hundred of thousands of negative ions to balance out the ion ratio to a more 'natural' state by neutralize the positive ions. The frequent use of USB Computer Ionizer could improve the surrounding environment by decreasing the electric magnetic disturbances, purify the air, disinfect, kill the bacteria, improve the function for oxygen supplying and strengthen the personal immunity. Convenient to use by just direct plug in USB port. No battery or adaptor is needed!