Just discovered on Amibay is this little jem  Called the Joy-Fi, it’s a wireless Joystick adapter for Atari/C64/Amiga.

It comes as two circuit boards, a master and a slave. One plugs into the joystick ports of your computer and the other plugs into a 9v battery and two Joysticks (Paddles, Tablets & Mice are not supported but the device is software upgradable so it’s a possibility).

Also available on the designers website, it costs 249kr (Approximately $30 or  £22) and is also available as a kit for 149kr ($17, £13)
Worldwide shipping is 38kr ($5, £3)