The Clairvoyant Alice (千里眼のアリス Senrigan no Arisu) allows the holder to see anything they wish in real time. The holder's range of sight does not appear to be limited any specified distance range.
This Alice was first presented in the Northern Woods Arc, when Serina was viewing Mikan Sakura's well-being in the forest. The Clairvoyant Alice was shown once again in the Leo Arc, where it was proven that the Clairvoyant Alice can be interfered by the Barrier Alice, like most Alices.
Professor Serina uses a crystal ball to utilize her Alice. She uses her Alice mainly as surveillance for the academy and supervision over the students.