Researchers at the Massachusetts Institute of Technology have developed a tiny wireless trackpad that can be worn on a thumbnail.

Called NailO, the prototype trackpad is similar to the stick-on nails sometimes used as a fashion accessory. It attaches to the user’s thumb and can be controlled by running a finger over its surface.

The researchers say an advantage of the device is that it’s discrete. Running a finger over a thumbnail is a natural activity, so most people wouldn’t notice this as a deliberate action to control a device.

It can also be an easier control option than a traditional trackpad or mouse in some situations.

In a video demonstrating the device, it’s shown being used to scroll through a recipe while the wearer’s hands are otherwise occupied holding spoons while preparing food.

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