There are three different kinds of function for the monitor 

Option 1

video input	2-CH  input
screen size	7" digital LCD monitor
type	16:9 wide screen
resolution	800x480
color system	auto
power requirement	12V/32V DC
power consumption	less than 8.6W
operating temperature	-10 degree to  65 degree
reverse guide	yes
mirror/normal switch	yes
reverse triger	automatically
speaker	optional

Option 2

video input	4-CH input without quad
screen size	7" digital LCD monitor
type	16:9 wide screen
resolution	800x480
color system	auto
power requirement	12V/32V DC
power consumption	less than 8.6W
operating temperature	-10 degree to  65 degree
reverse guide	yes
mirror/normal switch	yes
reverse triger	automatically
speaker	optional

Option 3

video input	4-CH  input with quad
screen size	7" digital LCD monitor
type	16:9 wide screen
resolution	800x480
color system	auto
power requirement	12V/32V DC
power consumption	less than 8.6W
operating temperature	-10 degree to  65 degree
reverse guide	yes
mirror/normal switch	yes
reverse triger	automatically
speaker	optional