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What’s the main difference between these 3 sizes of Display?

2.9-inch
4.2-inch

7.5-inch
E-paper & Non-touch screen
Color Built-in
Black+White+Red/Yellow
Black+WhiteBlack+White+Red/Yellow
Battery2 x CR2032 Replaceable2 x CR3032 Replaceablebuilt-in rechargeable polymer (4 hours fully charged)
Refresh Times
5000 =10 times/day last for 1 year

8000 =20 times/day last for 1 year
8000 =20 times/day last for 1 year
Connectivity
ZigBee Only
ZigBee OnlyWi-Fi + ZigBee (Dual mode)
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