Very Good

I like this little gadget. I can't know properly it's wider effects against pathogens, but I can say that since I've been using it my allergic reactions have greatly reduced: post nasal drip when lying down. Fairly soon after purchasing so time might tell. But I will say I'm glad I have it by me.

The purifier comes charged and I haven’t had to charge it since. Bought these for myself and family it is handy and light weight on the neck, peace of mind a little extra protection against pollutants and pollens when out. A bit pricey though.

I do notice a difference when I'm wearing this device. I wish the cord looked more attractive and I should have purchased the white model and not the black. Everyone thinks I'm wearing a recording device so I'm explaining a lot. I find it looks ridiculous with my necklaces and dressy clothing but I wear it anyway. I find it's helpful for musty situations, pollen and even being around people who wear too many perfume or essential oils. You still smell them but it's not overpowering anymore. The unit doesn't work great on smoke but given the size you can't expect it to do everything. I do wish there was a little fan so the cleaner air would be circulated around my mouth and nose but I imagine that would make noise. I like how silent this device is. You can't hear a thing unless you put it up against your ear and then you hear the faintest push sound. I can use it beside my bed at night and not hear a thing. The light on the back makes use at night slightly less enjoyable but I put a piece of electrical tape over it and that solves that problem.The cord is the biggest con. It's ugly and doesn't feel the best against the skin. Kind of like carrying a used rope around your neck but you get used to it quickly.Wish there was a clip on the rechargeable version like there is on the battery powered one. Or at least the option. If it had a clip on the back of the unit I could clip it to my collars and hide the cord under my clothing for more discreet use.If you're expecting to a shot of crystal clean oxygen your expectations are too high. If you want something to help make life a bit more bearable when suffering from allergies it's worth every penny.Con: Cord is unsightly, no clip, stands out when wearingPro: Silent, rechargeable, lightweight, works as an excellent aid

It is a good product , i ordered it to prevent my self from pollution in delhi , though it reduces pollution level (pm 2.5 approx 70 to 80 percentage for pm level of 250 and below it is inefficient to reduce pollution when pm 2.5 is above 500, also it needs to wear as near as possible bcoz distance reduce it's effectiveness. So definitely not usable for very heavy pollution like in new Delhi but good for country like US where the air quality is decent , i attached photos you can see pollution levels are reduced after 3 min s of placing it near by