While the product looks identical to the sonoff S55 plug, even when it comes to the design of the packaging, this socket doesn’t make use of the ESP-chip but has a CB3S installed.
Unfortunately this chip has a different pin layout and cannot be flashed with the tasmota firmware.
I might give openBK a try, but access to the contact pins seems difficult.

We haven’t tested it yet, we’re just a little worried we can’t get your battery. Arrived in good condition and on time, thank you for that.

Just didn’t send anything! Although it was written express!!!!

Great product works great, recommended

I already have these controls, they are very good. But better put them in something, to avoid touching the keys by mistake