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, and was inspired by the colorful stickers that people apply to their nails as a form of self-expression and style. It attaches to the user’s thumb and can be controlled by running a finger over its surface. The researchers envision the device could be extremely personable and therefore feel more like an extension of your body.

The 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.