I am no longer sure to buy Beok BOT-313 because I have read in some customer reviews that the minimum differential that can be set is + - 1 degree Celsius.
So if you set the temperature to 20 degrees the thermostat turns off at 21 degrees and turns it on at 19 degrees.
Two degrees of temperature variation is certainly not comfortable.
I do not think other Wifi thermostats model have this problem.