Hanging Neck Purifier Mini Negative Purifier Portable Purifier Wearable Necklace Purifier & UVC Sterilizer Portable Portable Purifier Features: Breathing cleaner: Scientific evidence has shown that it canremove most of the cooking odors, and even PM2.5 AIRpollutants, improving mood and sleep. Carry it with you: Bring a lanyard so you can wear this mini AIRpurifier around your neck and enjoy freshAIR anytime, anywhere. Long battery life: This wearableAIR purifier necklace can be used continuously for 35-40 hours with a full charge, and can be recharged for 500 cycles. No filter required: Adopting the principle of a negativeION generator, there is no need to replace filter components for life. Save you money and time! Best choice: Say goodbye to ordinary large-sized purifiers! This portable freshener is perfect for people with allergies, asthma, nasal congestion, and other respiratory sensitivities. Avoid annoying artificial scenes. Product Description: Working principle: negative Noise: Below 36dB (dB) purifier volume: 50 meters/hour Power mode: USB Control : button type Style: Hanging neck Installation does not require installation Energy efficiency level No energy efficiency level process: ABS Package including 1x Necklace Purifier 1x USB Charging Cable