Where can I locate the serial number? GVIDO MUSIC Customer Support 04 February 2021 01:25 Updated It is listed on the microSD card tray. Related articles Who should I contact when I need technical support for GVIDO product? How to modify the PDF page size/DPI: Can I use GVIDO without a desktop? How long is the warranty? What color and resolution should I select when scanning/saving scores?