4G sim slot connection Speed
5G Wifi Hotspot connect
1280 x 720px screen resolution 
2GB RAM + 32GB ROM
4GB RAM + 32GB ROM
4GB RAM + 64GB ROM + 360 Birdview Camera
4GB RAM + 64GB ROM ( 2K screen )
6GB RAM + 128GB ROM 
8GB RAM + 128GB ROM + 360 Birdview Camera

Split screen ( left right screen )

USB adapter video output connect for HDMI or RCA output 
( can use for dual screen function , front and rear different video screen )