Wearable air purifier necklace Efficient Purification : Millions of negative ions can effectively clean the air and indoor harmful substances. For example secondhand smoke etc.Rechargeable Battery: Replacing Batteries becomes a thing of the past, HiKiNS personal air purifier wareable is charged by USB data line. It operates for 2 darys on one single charge.Portable : simple and compact, allowing you to breath clean air wherever you go. This portable air purifier necklace also is a perfect gift for family, friends, and office matesEasy Operation and Silent operation: Only one switch button, and the operation is simple. Free switching between the two modes, high power mode, the wearable air purifier purification effect is the best; low power mode, the purification time is the most lasting. No noisy fans or motors, no electromagnetic radiation, You can enjoy fresh air and safely fall into sleep.NOTICE: The principle of this unit is to release negative ions to purify the air, which is effective in a relatively closed environment, such as by car or in the bedroom. Putting it in the bedroom has a certain effect on improving sleep. The effect of all air purifiers is not very obvious, but it is really effective to test it with the instrument. Please refer to the main picture video experiment.