antique audio background blank buttons casette cassette data dirty isolated listen magnetic media mix mixing mono music object obsolete old plastic play player record recorder retro run side song sound stereo tape technology transparent used vintage accuracy antigen check checking colloidal coronavirus covid-virus detection diagnosis diagnostic-aid dropper drops home-use immunochromatographic-technology kit limitations limited lysis-buffer measuring-instrument medical nasal-secretion negative-result quality-control-C-line rapid rectangular result sample sampling-tube self-testing test test-cassette testing extraction-reagent-tube nasal sterile-swab swab