AC Adapter, 230V - 10V Transformer Type G Plug (British) : Set 9833-3 | BrickLink
Amazon.com: UpBright New AC/AC Adapter Compatible with Model PI-41-824EU PI-41824EU Lego Element 86716 Item 4557552 NXT Mindstorms 9833 K9833-1 Toy Transformer 10VAC Power Supply Cord Cable Battery Charger Mains