One of the cowl's ears carries a high-gain antenna for an internal communication device on the left side of the cowl, allowing Batman to stay in contact with his allies. This communication device is capable of scanning police radios and other communication frequencies. It also carries an inertial navigation unit to keep him in balance when facing foes such as the Scarecrow or Count Vertigo. The cowl's Kevlar panels provide a level of protection for his head against firearms. The front of the skull and the sides of the temples also have small armor inserts to increase the effectiveness of skull strikes and protect from concussive blows. Repeated encounters with the Mad Hatter also forced Batman to shield his cowl against the villain's mind control. Its basic design has remained unchanged; however, it has been frequently updated for Batman's needs.