X-Readers are high tech computers used to collect and store large amounts of Kairu energy. It may analyze, store, and activate Kairu energy. When a new concentration of energy is discovered, it draws it is like a magnet, analyzes its structure, and gives the Kairu Master a detailed report on the type of Kairu and its level of power. The Kairu Master may also access the type of Kairu battle they are about to enter and then choose the right type of powers to use.
- In the anime, there are two types of X-Readers: the regular X-Reader and the training X-Reader, which has limited X-Drives.
- In the cartoon,Mookee has a training X-Reader which holds limited X-Drives but Mookee is only shown to use one monster:Scarachnoz