Features： With 4 layers of filter, one of them is PM2.5 filter, can effectively filter dust and small particles, purifying the air you breathe in. LED light up display, content can be freely selected via smartphone APP control, also support multiple languages and DIY mode, always be the focus of attention! Made from premium silicone, soft and comfortable to wear, can be washed repeatedly, durable and environmentally friendly. The display will show rhythm effect if activated by sound, perfect for Halloween cosplay party, fun performances, clubs, sports, bars, etc. With adjustable strap, suitable for men, women, young kids and students, a nice Halloween, birthday, and holiday gift for friends and families.