The Xbox 360 E power supply is rated at 120 watts and the Xbox 360 S unit supplies 135 watts. However, there are three types of power supply units supplied with the Xbox 360 original console ? supplying 203, 175 or 150 watts.
The power supplies of the Xbox 360s model in the United States are physically smaller than those of other countries, but they have the same capabilities. Microsoft states that the 120-watt unit is interchangeable with the 135-watt power supply, and either can be used with both the Xbox 360 E and Xbox 360 S. To prevent damage caused by plugging in the wrong power supply, the DC end of the Xbox 360 original console power cord has a keyed connector.