One is it prevents you to transmit virus to other people. One is it prevents a direct transmission by somebody speaking to you. One is it protects your own face against your own unwashed hands touching the surface. It has three different uses.
One is it prevents you to transmit virus to other people. One is it prevents a direct transmission by somebody speaking to you. One is it protects your own face against your own unwashed hands touching the surface. It has three different uses.