File the widened ‘polarization tip’ off the one prong of the plug so it’ll plug into the old 220 V. British (round prong) tip adaptor. Use the brown extension cord not only to bring the electric closer to you (in rooms that only have 1 plug for the whole room), but also to multiply the plug so you can charge your devices along with those of your roommate. :-) Many rooms will have only one plug.