KN95 is Equivalent to N95. KN95 is the chinese regulated version of European version of the N95 (European regulations) (Check Images for specifics).
This mask can be worn in 2-4 days, as long as the elasticity remains, and keeps an Air tight Seal along the face.
These masks filter out 95% of airborne particles and are recommended to use in order to prevent catching the corona virus.
Check images to see the president of china wearing the same type of mask.