Our Gen1 systems are manufactured by Infomir in Ukraine. Some models have a logo “MAG” in large letters on the top of the device…
This is a Gen1 system:

Other models have a red circle on the top of the device…
This is also a Gen1 system:

If you do not have one of the two above devices, then you have a Gen2 or Gen3 system.
The following are common Gen2 devices, all manufactured by Formuler in South Korea: Z8, Z8 Pro, Z+ Neo, GTV, Z10, Z10SE, Z10 Neo, Z10 Pro, Z10 Pro Max. Any member of the Z8 and Z10 families are usable as a Gen2 device
Gen3 systems are members of the Z11 family, including Z11 Pro, Z11 Pro Max, and Z Mini.