The USBC-VAMETER has had three revisions. Units purchased before Q1 2018 are our original design. Units purchased after Q1 2018 through Q1 2021 are an updated design. Units purchased after Q2 2021 are our newest design. If you have issues with your USBC-VAMETER of any revision please feel free to contact us at support@plugable.com and we'll be happy to assist!