DS time radar

"My DS time radar puts Peach somewhere in the Mushroom Kingdom of yesteryear."

- Professor Elvin Gadd

The DS time radar is a machine invented by Professor E. Gadd which appears in the game Mario & Luigi: Partners in Time. It is first used after defeating Junior Shrooboid, where E. Gadd uses it to find out in what time period and where Princess Peach was. It reveals she was stuck in the past of the Mushroom Kingdom. The DS time radar was also used to activate the Hydrogush 4000 later in the game.

The DS time radar looks exactly like a Nintendo DS (hence its name), and also appears to include a stylus.

Zeitradar