CoviSelf Covid 19 Rapid Antigen Self Test KitThe test device contains colloid gold conjugate pad and a membrane strip pre-coated with antibodies specific to SARS-CoV-2 antigen on a test lines (T). If SARS-CoV-2 antigen is present in the specimen, a visible band appears on the test line (T) as the antibody-antigen-antibody gold conjugate complex forms.