In the star standard, four-star hotels need several power outlets.

There must be at least two kinds of power sockets, and there must be more than two power sockets for guests.

Universal: 1, power socket; 2. Standard socket; 3. Universal sockets (at least two, which can be plugged into most countries in the world such as Europe, Britain and the United States); 4. The toilet is equipped with 146 special socket for shaver (1 10V/220V).

Except razors, the voltage of power adapters such as mobile phones, PADs and notebook computers is generally 100~240V, so it is no problem to charge mobile phones, PADs and notebook computers at 220V V. However, plugs in different countries are different, so universal sockets can be used to support plugs in different countries. However, because the universal socket should be compatible with plugs all over the world, it will have less contact with specific plugs and be prone to heat, so it is not suitable for plugging in electrical appliances with slightly higher power. Fortunately, the power of mobile phones, PADs, laptops and other electrical appliances is very small.