Hi My friend.
Recently I have one advise product for your requirement. MMC company Etlas Mobile, some of my friends used it and performance is so good. I’m considering to buy a new one recently. Here I attached some specifications for your reference.
Size (L W H):320x142x54mm
Operating System: Android 7.1, Six-Core Processor
Screen: 7-Inch Touch Screen
Video Output: HDMI
Working Temperature: -20℃~55℃
Max Brightness: 1200nit
Touch Screen: Max. 5-point Simultaneous Touch
Connector: USB,HDMI,MICRO SD,MICRO SIM,UART
Battery Life: 5 Hours