The Xbox 360 Controller is the primary controller for Microsoft's Xbox 360 console and was introduced at E3 2005. The Xbox 360 controller comes in both wired and wireless versions. Original Xbox controllers are not compatible with the Xbox 360. The controller is also compatible with PCs; the wireless version requires a Wireless Gaming Receiver.
The wireless controllers run on either AA batteries or a rechargeable battery pack. The wired controllers may be connected to any of theUSB ports on the console, or to an attached USB hub.
The Xbox 360 controller has the same basic familiar button layout as the Controller S except that a few of the auxiliary buttons have been moved. The "back" and "start" buttons have been moved to a more central position on the face of the controller, and the "white" and "black" buttons have been removed and replaced with two new bumpers that are positioned over the analog triggers on the back of the controller. The controller has a 2.5 mm TRS connector on the front, allowing users to connect a headset for voice communication. It also features a proprietary serial connector  (which is split into 2 parts on either side of the headset connector) for use with additional accessories, such as the chatpad.
On August 31, 2010, Microsoft's Larry Hryb (a.k.a. Major Nelson) revealed a new design of the Xbox 360 controller which is set to replace the Wireless controller bundled with the Play & Charge Kit. Among small changes such as the shape of the analog stick tops and grey-colored face buttons, the new controller features an adjustable directional pad which can be changed between a disc type D-pad or a plus shaped D-pad. The control pad was released in North America exclusively with Play & Charge Kits on November 9, 2010 and was released in Europe during February 2011.
A standard Xbox 360 controller features eleven* digital buttons, two analog triggers, two analog sticks and a digital D-pad. The right face of the controller features four digital actions buttons; a green "A" button, red "B" button, blue "X" button and amber "Y" button. The lower right houses the right analog stick, in lower left is a digital D-pad and on the left face is the left analog stick. Both analog sticks can also be "clicked in" to activate a digital button beneath. In the center of the controller face are digital "Start", "Back" and "Guide" buttons. The "Guide" button is labelled with the Xbox logo, and is used to turn on the console/controller and to access the guide menu. It is also surrounded by the "ring of light", which indicates the controller number, as well as flashing when connecting and to provide notifications. The left and right "shoulders" each feature a digital shoulder button, or "bumper", and an analog trigger.