The Pyramex Sentinel Electronic Earmuff offers a noise reduction rating (NRR) of 26dB, making it suitable for reducing harmful sounds while enhancing ambient hearing. This earmuff is designed with height adjustment to fit most users and features a fold-away padded headband for comfort during extended wear.Key FeaturesNoise Reduction Rating: Provides an NRR of 26dB for effective sound suppression.Front Facing Microphone: Amplifies surrounding sounds while reducing harmful noise levels.Auto Shut-Off: Automatically shuts off after four hours to conserve battery life.AUX Jack: Includes a 3.5 mm AUX jack for connecting to MP3 players and mobile devices.Included Batteries: Comes with two AAA batteries for immediate use.