Virus Block Air cleaner, Once Open Work for 30 days, Sanitize Air around 1mtr around you and block the virus around you. It is Suitable for everyone from kids to adults, especially suitable for sick patients, people with low immunity. It is an essential item for family members to go out during this pandemic situation. HOW TO USE : Remove the outer packing bag and remove the product. Pin the lanyard on the bag. Hang on a neck or carry-on items change about 30 days.