Good Morning Annette,
Thanks for your post, the electrical supply in China is 220 volts, and we recommend you pack a universal electrical adaptor.
In regards to Malaria we strictly follow FCO advise and monitor the situations very closely, should your holiday look as though it may be affected then we advise you asap, however in regards to Malaria tablets, you really have to follow the advice of your GP, I am unable to offer any advice on this,
I hope this helps,
Kindest,
Ben