4.2inch E-Paper Cloud Module, 400×300, ESP32 WiFi Connectivity, 3000mAh Battery Included

Quick Overview : 

• Integrates SW6106 chip, supports multiple quick charge protocols including PD / QC / FCP / PE / SFCP, etc.
• Allows user to control the display content via remote server, convenient and flexible ID support, make it easy to centrally manage and track the modules
• Provides Android APP for configuring and managing the modules
• No backlight, keeps displaying last content for a long time even when power down
• Long battery life, basically power consumption is only required for refreshing
• Comes with development resources and manual (examples for Raspberry Pi)

Resources :  http://www.waveshare.com/wiki/4.2inch_e-Paper_Cloud_Module

Specifications : 

• Communication : WiFi 2.4GHz, Bluetooth4.2
• Battery : 3000mAh Li battery
• Display Color : Black and White
• Resolution : 400x300
• Outline Dimensions : 96.5 × 85mm
• Display Size : 84.8 × 63.6mm
• Full refresh time : 4 Seconds
• View Angle : >170°
• Dot Pitch : 0.212 × 0.212mm ​