What do you use for watchdog ?

I have a programmable on-off switch that I can control from my phone but it's not automated.
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I am using this one
https://www.ebay.com/itm/Watchdog-Timer-USB-DOG-Terminator-NEW-2017-Ethereum-Mining-automatic-Reboot-Boar/152735927628?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D48740%26meid%3Dadffe35ccdf440f38d8bc00c571861a8%26pid%3D100005%26rk%3D1%26rkt%3D6%26sd%3D132231222514&_trksid=p2047675.c100005.m1851

It is cheap and delivery was within 2 weeks.
Small program controls if it's windows still alive and not freezing. If the watchdog loose connection with program, after few seconds hard reset is enabled.