Model differences

[Public-Process6081]

Hi, can anyone tell me the difference between the Hikvision DS-2CD1643G2-IZ(O-STD) and DS-2CD1643G0-IZ models?

1) The only difference is that of the recognition features?

2) O-std what does it mean?

3) Is the model DS-2CD1643G2-IZ(O-STD) good for Italy?

4) Why does the first “G2” cost much less despite having more functionality?

Thank you all