Compare NDF820 with NDF831 (2)

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	Messoa NDF820	Messoa NDF831
	Contact manufacturer	Contact manufacturer
Chip Inch Size	1/3	1/3
Colour Type	Colour	Colour
Sensitivity lux	0.1	0.5
Voltage	24 V AC, 12 V DC	12V DC / 24 V AC, PoE
Focal length	4	3 ~ 9
Compression	H.264, MPEG4, Motion JPEG	M-JPEG, JPEG, MPEG-4
Back Light Compensation	✔	✔
Auto Gain Control	✔	✔
White Balance	✔	✔
Electronic Shutter range	1/10000 ~ 1/3.75	1/30; Support long shutter 1/7.5~4
Synchronisation	Internal	Internal
Signal Mode	PAL/NTSC	PAL/NTSC
Resolution TVL	--	1280x 960
Pan Speed ^o/ sec	--	350
Digital (DSP)	--	✔
Tilt Speed ^o/ sec	--	150
Indoor/Outdoor	--	Indoor/Outdoor
Rotation Angles^o	--	31.8 ~ 90 (H) x 23.9 ~ 66.2
Built-in IR LED	--	✔

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