Here is an original watch where the date and time are packaged as a barcode, which changes every second! You can even scan it!
With battery indicator.
The barcode number represents the date (MM DD YY, DD MM YY, or YY MM DD), followed by the time (HH MM SS, 12/24h format), depending on the settings of your phone or watch.
Support for ambient mode, low-bit ambient mode, and burn-in protection mode.