To quote from their page: XCM wireless controller shell v2: the new version will come with the Autofire function on both trigger buttons, simply turn on the Autofire you are able to enjoy the rapidfire shooting on all the FPS games.
Install is easy and remember our wireless controller shell also built in the LED lights on the buttons, so you are sure to own a cool and functional gaming tool for the gameplay!
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This is the first of two new additions to the http://www.xcm.cc/ product line we are reporting on today, specifically new XCM XBox 360 Wireless Shells with LED Analog Sticks and a new D-Pad have arrived!
The new XCM XBox 360 Wireless Shells come in four colors, as follows: http://www.xcm.cc/wireless_shell_with_LED_analog_stick_CG.htm, http://www.xcm.cc/wireless_shell_with_LED_analog_stick_CR.htm, http://www.xcm.cc/wireless_shell_with_LED_analog_stick_CB.htm and http://www.xcm.cc/wireless_shell_with_LED_analog_stick_CY.htm.
They have also made available a detailed http://www.xcm.cc/wireless_shell_with_led_analog_stick_installation.htm for the new XCM Wireless Shells.
Finally, those interested in grabbing one can do so via one of their many http://www.xcm.cc/Resellers.htm from around the globe. Cheers!