The specification of the suction cup actually mentions a country plug. This is of course rubbish. There is nothing with a cable to connect to this appliance. So there is no fixed adapter included.
What you need is a Bosch Professional 18 battery and a suitable charger. E.g. https://www.galaxus.ch/de/s4/product/bosch-professional-starter-set-18-v-werkzeugakku-ladegeraet-6514398. Certain product sets in the 18V Professional (blue) range include a charger and battery. You have to see this as a basic decision. The more tools from this really high-quality range, the better.

Nothing like that was included with me either - it's not necessary...
The vacuum cleaner is first class - but an 8 Ah battery is an advantage if you want to work with it for longer.