The Peltor Sporttac hearing protector: Tactical Sport headset MT16H210F-479-SV is a compact hearing protector that features electronic sound amplification and hearing protection. These Tactical Sport Headsets by Peltor provide distortion-free amplification of low level sounds. The Peltor Tactical Sport Hearing Protector also protects against harmful noise levels with its Noise Reduction Rating (NRR) of 20 decibels (dB). These Peltor Hearing Protectors have a folding headband design for easy portability, and interchangeable outer cup shells. The Peltor Tactical Sport Headband comes standard with green ear cups and an extra set of orange cups. The Peltor Tactical Sport Headset operates on 2 AAA Batteries with a battery life of 500 hours.