Is included (USB-C). Works without any problems.

Hello o.kunz,
I personally bought the Jackery extension cable Jackery Extension Cable (Solar System Mounting Hardware) because it is not always possible to place the solar collector and the battery close to each other.
For information the plug is SCHUKO type to facilitate the connection, I also bought the adaptation cable Max Hauri Câble de transition TD H05VV-F3G1.5 0.5m Max Hauri Câble de transition TD H05VV-F3G1.5 0.5m (0.50 m, Type 23)
I hope you find this information useful ;-)

Many thanks for your help 👍🏻