The original Makey Makey Classic -

Makes STEM Education fun! Start out easy with a banana piano. First setup takes seconds. Then make game controllers, musical instruments, and countless inventions. Advance to additional inputs and multi-key remapping up to 18 keys. Ages 8 to infinity.

Turn everyday objects like bananas into touchpads!
Connect the world around you to your computer! Setup takes just seconds.
Just plug, clip, and play! No programing knowledge needed. No software to install. Works with Mac, Windows, Chromebook, Linux. If the device supports a USB keyboard or mouse, it should work with Makey Makey!
1000s of possibilities! Draw your own game controller, sneak a cat selfie, and dance like never before.
Ages 8 to infinity.

https://makeymakey.com/products/makey-makey-kit
https://makeymakey.com/pages/how-to