What is it?
The Dragonball radar is a small pocket watch sized device that is made especially to find dragonballs. It has a little map on it showing where the dragonballs are and the approximate distance that they are from you. It has different zoom levels depending on how close to the dragonball you are. It has a green screed, and the dragonballs appear as yellow dots on the screen. There is a button at the top of the radar to change the zoom level. This device has changed the way dragonballs are viewed, before it was a matter of when in the next century will they be found, and now it's how fast in the next few days can they all be gathered.

Who Made it?
At first, in Dragonball, a girl named Bulma Briefs made the dragon radar. She wanted to wish for a perfect boyfriend, and so she made the radar in order to be able to find the dragonballs faster, and be able to use them more often. The bad thing about this is that the dragonballs aren't made to be used so often. They are only supposed to be used about 1 time every 100 years. But now that the dragon radar was invented they are able to be gathered within a few months maybe even weeks, and they can be used much more often then that. Without the radar, the dragonballs would normally take centuries to gather all together, but now that the radar is here it changes it all. Therefore since the dragonballs were sued so much more often then they were supposed to they built up a lot of evil energy, and spawned the Evil Shenrons in Dragonball GT.

What Else?
Well the dragonball Radar that bulma made isn't the only one. Because as we see in dragonball GT there is also a dragonball radar in a robot called Giru. We see the gang using this dragonball radar more often then the original, possibly because Giru has more advantages and features then an average dragon radar does. One of these advantages may include that he has a greater range then the original dragonball radar because they used him while they were in space looking for the black star dragonballs and considering that the dragonballs spanned over many planets, and Giru was able to locate them all, he must have a longer range then the original dragonball radar which was only able to locate dragonballs on a single planet.