Casting the same buffs every time after resting can be very annoying. But no longer! Just cast your buffing spells on the device and it will store, which spells you have cast. If you use the device, it will command your character to cast all the stored spells in no time. It is not necessary to reset the device, because it checks, if you have the stored spells memorized. However, from time to time, I would recommend it nonetheless. To reset the device, cast Flare on it. To see which spells are stored, cast Electric Jolt on it. The item is not usable in combat. It is meant as a time safer, not for cheating.