M5 Necklace Wearable Mini Personal Air Purifier with USB | Negative Ion Generator | Purifies Air Eliminating Germs, Dust, Viruses, Bacteria, Allergens, Mold, Odors, and More (White)

It works but beware if it swings round and the point touches you it hurts. I've attached a piece of plastic to the front to stop it touching me.

It's a small gadget almost an accessory. It just makes that beeping sound all the time. It's not silent at all. It's tolerable after a while though.Otherwise, will see how this gadget will be helpful overall.

ETA 2021: Since buying this AVICHE M5, it emits a high-pitched, irritating bleeping whine that may be on the edge of peoples' hearing spectrum, nevertheless it's very annoying and especially at night.2nd Edit 16th February 2023.Shortly after I posted this original review, the seller refunded me, which I thought was generous. Also I was allowed to keep it, and to my surprise, 2 years later this high-pitched whine stopped. Honestly, I don't know what caused the whine, but am very pleased it's finally stopped.Because of this, I've reduced its rating from 5 Stars to just 3.