Dragon Radar

The portative Dragon Radar was designed, and built by Bulma to help locate Dragon Balls. Although the Z Fighters' Dragon Radar was developed by Bulma, Bulma is not the one who developed the concept of a Dragon Radar, as Emperor Pilaf, as well as the Red Ribbon Army, possess Global Dragon Radars that are implied to have been invented before Goku and Bulma met each other. Dragon Balls emit a faint electromagnetic pulse,[5] which Dragon Radars can detect. The Dragon Radar developed by Bulma points arrows in the directions of nearby Dragon Balls. Pressing the button on the top can cause the view to zoom out and show a more detailed map of the area.