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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+White | Black+White+Red/Yellow |
| Battery | 2 x CR2032 Replaceable | 2 x CR3032 Replaceable | built-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 Only | Wi-Fi + ZigBee (Dual mode) |