Hello, hope this helps you:
"Rules also apply to e-scooters in terms of performance and equipment. For example, the permitted speed may be a minimum of 6 km/h and a maximum of 20 km/h depending on the design. In addition, the mini electric vehicle must have the following features, among others:

two independent brakes
a white headlight at the front
a red rear light
a bell"
Found at: https://www.bussgeldkatalog.org/e-scooter-...