This headset has been designed with a unique frequency response that amplifies signals, voices and warning sirens, while at the same time suppressing dangerous impulse noises. Headset is ideal for maintenance workers, forklift drivers, airport workers and more. Stereo cup microphones provide 360 deg of external ambient listening capability. Unit features a folding headband combination liquid/gel filled ear cushions. Audio jack allows for optional radio connections. Runs on 2 AA batteries (not included).