This is a case designed for 4.2" E-Paper or E-Ink Displays. It can be used as a Weather Station for example.
It operates from rechargeable batteries and is thus completely wireless. A WiFi-Connection is needed for the Weather Station program. In my experience the two 500mAh batteries (combined 1Ah 3.3V) last for three months provided that they don't get drained when there's no WiFi or Internet and the ESP32 is constantly attempting to get data.
in order to protect your cells from over-discharge I'd advise to use a BMS.
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