The are a lot on Chinese watchdogs on the market. You can find them on Aliexpress or Ebay. They can come in different shapes and flavors but based on the same chip.
To test reset you can run the following command after connecting it to your system
Run this command to check device id
Supported chips are
1a86:7523 5131:2007 0471:2379
There is another kind of watchdog with the same id but on Arduino Nano. It can’t be detected. To use it you need to run