It looks to be a variant of the Joy Tech Jolt Pack:
http://www.ebay.co.uk/itm...N&hash=item2ed21e52b9You can see one that is almost identical here:
http://www.ebay.com/itm/J...s&hash=item2a3741e8f8I'm not sure if the Lego one is just a rumble pack or a rumble + memory pack.
Looking at the sticker on the following auction it looks to be factory applied. I wonder if it is a memory card + rumble pack combo that contains lego racers data.
http://www.ebay.co.uk/itm...S&hash=item3ccbce4539It looks like the company name is Joy Tech Europe:
As of September 7, 2007, Joytech Europe, Ltd. was acquired by Mad Catz Interactive Inc. Joytech Europe, Ltd. designs, manufactures, and distributes video game peripherals in the United Kingdom, Europe, and North America. Its products include play stations, Xbox, digital LCD monitors, tuners and adapters, wireless and analog controllers, racing wheels, memory and power stations, digital optical cables, fusion charging station and controller skin, cooling fans, power grip, movie charge stand, carry cases, memory packs, racing grip, silicon gloves, shooters, and game pads. The company was founded in 1996 and is based in Windsor, United Kingdom with offices in France, Germany, Italy, Benelux, Australia, and Hong Kong
From the manual:*The unlocked Circuits will be saved to a Controller Pak if one is
inserted. If you do not have a Controller Pak, Circuits can still be unlocked,
but the unlocked information will be lost when the Control Deck is turned off.
This makes me believe that the item listed above is a two in one. It is a memory card and rumble pack. This way you can save and have rumble.