Read more on project page: https://github.com/EGG-electric-unicycle/documentation/wiki
EGG Electric Unicycle is a DIY and OpenSource design that can be customized for specific needs (more batteries, powerful motor, lights, etc). Main characteristics of current version:
Max velocity up to 30km/h
2 battery packs making a total of 264W (range of 20kms on flat roads with a rider of 100kgs)
500W motor, 14 inches wheel
Bluetooth for configuration and reading in real time the speed, current, board temperature, etc
Video promotional:
Video "EGG Electric Unicycle - promotion at Makerfaire Lisbon":