I normally just use Magellan's guide to figure out which adaptor plug(s) I need; however, Magellan's lists 12 different ones for China -- 6 grounded and 6 2 plug. Can anyone tell me what I need for the hotels in these two cities. I'm not sure if it makes a difference but we're at the Penninsula in Beijing and the Hyatt Shangri La in Shanghai.