Telescope Technique (Earth-2356)

By peering into a kyber crystal ball, the user can see the current activities of anyone whose midi-chlorian signature they know. Users can view subjects from any location in a specific place, regardless of distance or potential obstructions, making it ideal for intelligence gathering. Grand Master Yoda secretly used this technique to monitor the Jedi Temple.

Source

 * https://naruto.fandom.com/wiki/Telescope_Technique