Confusion
When the robots are taken to the health center, the confusion may happen and cause problems. Even though we could set the specific mode, when it comes to two or more robots playing different songs, patients may also feel confused.
Disturb
When the robots are taken with the patient, it may cause disturb sometimes. For example, we say the patient takes his robot in the public transport, and when it is the time for robot to play the have-a-nap song, it may disturb other people in the bus, and also will not be useful for patient himself.
Battery
The battery and charging may also be a problem, since people with dilemma