Wireless smart tags for possession-tracking seem to be one of the major trends for mobile device OEMs in 2021. According to a new patent application discovered on the CNIPA database, OPPO may be the next to jump onto this bandwagon. Its new Bluetooth tag looks much like that of Samsung's, although there are no indications as yet that the two would work in the exact same way.
https://www.notebookcheck.net/OPPO-patents-its-answer-to-the-Samsung-Galaxy-SmartTag-or-Apple-AirTag.517095.0.html