https://m5stack.com/collections/m5-c...isplay-235-ppi
I think this is very interesting because this device combines the display and form factor of a small e-book reader with a very power efficient esp32 development kit with wifi, Bluetooth, SD card reader, battery and USB C charging.
The M5Paper doesn't come with any useful functionality, out of the box, except some demo software and examples with source code. You, as a programmer, have to program the device to do what you want it to do. Think Arduino, MicroPython and Platform.IO. And the possibilities are mind-boggling.
It may be seen as a prototyping device, but when it has been programmed it is already good-looking enough for an end-user use as it as it is. Just write the software! Not very cheap at $69. But a super cheap and fast way to create a nice looking finished custom device with these capabilities.
Sure, make an e-reader or news reading device. Or a bedside clock or stock market ticker. Mail notifier or super-pager. Advanced time management event input device. Or one-tap ordering device on the fridge. Or a custom dash/remote/controller for a smart networked home/office/farm/greenhouse/shop/factory. And possibly all of that at the same time, if you are clever enough. Or something completely different.
(No connection, except as a customer. I've bought two... )