A:Before the usage, be sure the nose is clear.
about how to use the COZING-USBN, please view the link: https://youtu.be/mnuThP1oPoM
COZING-USBN1 is used to kill the virus which exist in the respiratory system, about how to use the COZING-USBN1,please view the link: https://youtu.be/1SebbRGf__0
COZING-USBN2 used the 808nm invisible laser light, and the penetration is very deep, and always used for the aged care, about how to use the COZING-USBN2, please view the link: https://youtu.be/RAIrl5sC840
