Wireless things with J

• Joystick

  Yes! Many joysticks work wirelessly via Bluetooth

• Jammer

  Radio jammer blocks wireless signals intentionally

• journal
• japan
• Jump drive

  Portable USB "jump drive" stores data; fully wireless after unplugging

• Jammers

  Wireless jammers emit signals to block other radios

The words in the list Wireless things with J come from players of the word game Categories game.