UPDATE: Since this story was published, Apple has released its new Bluetooth Mighty Mouse. You can read about the new product HERE

Apple has developed a wireless version of its Mighty Mouse, according to a US regulatory filing.

The new version of the mouse uses Bluetooth to maintain a link with the Mac, meaning Apple has been required to gain regulatory approval from the Federal Communications Commission before it can sell the device in the US. The FCC publishes applications for approval and it's from this information that details of the mouse, which has the codename 'M6', were disclosed.

The wireless Mighty Mouse looks much the same as the current wired version with the obvious exception of the cord. The mouse is powered by two AA-batteries and users will be able to check the current battery level through the Mac's system preferences menu.

No information about when the mouse will be announced or put on sale was included in the filing. Apple typically uses major calendar events to announce new products and the next such event is its Worldwide Developers Conference in San Francisco from August 7 to 11.