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Wikipedia
The Classic Controller contains slots on its backside, opened via a rectangular button at the top of the controller, presumably for attaching the controller to something else.[48] The purpose for these slots remains undisclosed,[49] but it is commonly believed to be used with a special clip that attaches the Wii Remote to the Classic Controller, enabling it to take advantage of the Wii Remote's motion-sensing and rumble capabilities, making it functionally equivalent to the PlayStation 3 controller; Nyko has released such a clip, in addition to a grip shell and a place to store the cable.[50] The body of the Classic Controller measures 65.7 mm tall, 135.7 mm wide, and 26 mm thick.