Does Proton Perdana has Screen Size（inch)?

No, Proton Perdana doesn't have Knee Airbags.

Here are the Rear Air-con and variants of Proton Perdana:

Yes, Proton Perdana has Front Foglamps, which are: 2018 Proton Perdana 2.0L, 2018 Proton Perdana 2.4L.

Here are the Auto Headlamps and variants of Proton Perdana:

Here are the Parking Camera and variants of Proton Perdana:

The Powertrain of the Proton Perdana are as follow:

Yes, Proton Perdana has Seatbelt Reminder, which are: 2018 Proton Perdana 2.0L, 2018 Proton Perdana 2.4L.

Here are the Steering and variants of Proton Perdana:

Here are the ASEAN NCAP Rating and variants of Proton Perdana:

Yes, Proton Perdana has Navigation, which are: 2018 Proton Perdana 2.4L.