Instructions
Take the Xbox 360 box and survey every side until you find the rectangular cut-out portion. Underneath the cut-out you will see the Xbox 360 model number, barcode and other numbers.
Find the voltage/amperage information. This should be at the lower-left portion of the cut-out right above the "MADE IN..." label.
Determine which version the Xbox 360 is. If the information shows as "12V...12.1A : 5V...1A," you are looking at an Xbox 360 with the Jasper version. If the information shows as "12V...14.2A : 5V...1A," you have a Falcon version.