These are the Phon Twins. They can use sound waves to pinpoint an enemy, they can also use sound waves as a power. The sound waves can create massive amounts of power to force the enemy out of a New York City, which is were they live.
The twins have an enemy that is called fire master. He is a fire breathing dragon that is deaf. He starts fires all over the city. But the Twins can only use there power for an hour out of the day.
The Twins saw the fire master starting trouble so as fast as lighting they put out the fires around the city and defeat the fire master for today at least.