Features:The sterili-zation card can be used continuously for 30 days after opening the packing.It can continuously release ultra-low concentration chlorine dioxide gas, purify the air, give you long lasting protection.360 full body protection, the card has a good dis-infection effect. Say goodbye to traditional dis-infection ways.Safe and reliable use, harmless to human body. Great Gift for children, adults and the elderly. Suitable for school, metro, office, home, outdoor activities, etc.Portable and easy to carry. It can hang on the chest or schoolbag or in pocket. Comes with a lanyard for more convenient use.