The A12 meets these specifications:
Galaxy Watch6 and Galaxy Watch6 Classic: Phones with Android 10.0 and RAM 2.0 GB or higher are supported. Galaxy Watch5 and Galaxy Watch5 Pro: Phones with Android 8.0 and RAM 1.5 GB or higher are supported. Galaxy Watch4 and Galaxy Watch4 Classic: Phones with Android 6.0 and RAM 1.5 GB or higher are supported.
Galaxy watch 4/Watch 4 classic no longer available from Samsung but will find them at other outlets, think though would be better to go for a more modern Device if you have had not had a smart watch in recent years.
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
