Hi, this is exactly the same model that I got. Mine has a different branding on but many sellers seem to have re-branded the same white-label model from China. They work well. They generate ozone for 30 min and then for 5 min every hour until the battery runs out. It has a micro USB battery charging port.

You can search for them by using the model number (ST-807A) or by searching for "ozone generator fridge" on your fav shopping sites.

Aliexpress has that exact model quite cost effectively. and a few more w/ higher outputs.