The voltage in China is 220V, 50 HZ. In most hotels' bathrooms, you can find an electric outlet for 110V but it is advisable to bring a transformer with you. Generally, there are two kinds of sockets in China, flat blade plug and V-shaped socket. If your plugs have different configurations, you will also need a plug adapter.
The tap water in China is undrinkable, even in the finest of hotels. Hotel room is often equipped with a water dispenser, which offers both cool and hot water. Some hotels rooms are equipped with a water heater, which you can use to boil tap water before drinking it. In some hotels, hot water is provided in a thermos in the guest room. Star rated hotels may supply high-quality bottle water for free.

Time, Weights and Measures of China Money Change, Credit Card and ATM in China Free Luggage Allowance Entry and Exit Regulations of China Communications in China Useful Chinese Words and Phrases Taking Photos in China Electricity and Water in China Chinese Etiquette Tipping in China