The electricity in China is generally 220V, 50HZ, AC (Hong Kong is 200V; Taiwan is 110V).If you travel to China and wish to bring electric devices for use during your stay, a transformer, which can be bought in China for CNY100-200, is necessary. Most of the hotels in China have both 110V and 220V electrical outlets in the bathrooms, though in guest rooms usually only 220V sockets are available.