How to tell if the IP Camera has Dual VCA feature before buying ?

[vbhoj74]

Hi, I've landed up buying few models which do not have dual-VCA, example DS-2CD3651G0-IZS & DS-2CD3321G0. I believe the G0 stands for Gen 0 , and maybe does not have Dual-VCA. With all the G2 models I've seen has dual-VCA, along with DS-2CD2355FWD-I.

How do we tell from the part codes if the camera indeed has dual-vca before buying ?

- thx.