This is a small LiPo battery powered display console.

Main features:

• 4.2 inch 400x300 E-Ink E-Paper Display Modul
• ESP32 Lolin32 board
• 4 capacitive touch buttons
• LiPo 3,7V 1000mAh

Note:
LiPo batteries cause a fire risk. You should test the proper charge and discharge behavior of the used board. Purchase high quality products. Don't use damaged or puffy LiPo batteries. Check regularly. Never leave the device charging while unattended. Remove the LiPo battery if the device is not used and store it safe. Respect correct disposal of the battery.

I am using this device to control some home automation features. It's controlled via the 4 touch buttons, which are used as soft keys. The ESP32 is normally in deep sleep mode and wakes up every minute to update the time, or if any buttons is touched. The communication is based on Bluetooth LE to a central, which provides the characteristics for the current time and status information to be displayed. Further BLE characteristics are available to control the home automation functions.
I have chosen BLE in order to consume less power. A 1000mAh battery should last 5 days.
Optionally a wireless QI receiver module can be used for convenient charging of the LiPo battery.

BoM:

• LOLIN32 V1.0.0-ESP32.
• Qi wirles charging receiver module (optional)
• Waveshare 4.2 inch 400x300 E-Ink E-Paper Display Modul - B/W version to allow fast partial update.
• LiPo with 2-pin JST-PH connector.
• 4 thumbtacks
• Dupont jumper wire - Optionally if you don't want to solder the buttons directly.
• Screws and Nuts.