Bat

are bats used in the anime by Rinji. Rinji has the ability to use ultrasonic waves to use the Bat Controlling technique so that he could communicate with bats, and likewise they can communicate with him. He is able to give them orders; like to search the area around him.

Once Rinji controls his bats, he can command them to produce high frequency ultrasonic waves that affect the mind of the opponent. These bats have proven to be an effective counter to the Crystal Release; the ultrasound waves move at a frequency that allowed the crystal to breakdown at a molecular level, alloweing dispersion of crystal particles back into the air.