Moderators are a vital component of the contest. They entertain, animate and lead the public through the competition. As well as specialist knowledge, they must have the ability to judge and steer the mood of the public. They are largely responsible for maintaining the entertainment aspect of the competition. Meanwhile they must cooperate with the athletes, the DJ and the judges (the moderator has to wait for a signal from the head of the judges before he gives the go for the next battle). They inform the athletes about their remaining time and announce the judges' decision after each battle.