MSA Supreme Pro earmuff with neckband offers police officers, military personnel and hunters optimum hearing protection with the ability to hear the surrounding environment. Digital electronic design is based upon a custom designed ASIC circuit and controlled by a microprocessor. It features AUX input for connecting external audio sources. Ear cups are shaped to suit both right and left handed shooters. It uses two standard AAA batteries that provide about 600 hrs of battery life. Two microphones provide Yes digital stereo directional sound.