The Allen Company Shotwave Low-Profile Earmuffs, with an integrated microphone, enables you to not have to yell across the line to hear each other talking. The auto shut off feature turns the microphone off when ambient noise is over 82dB to protect your hearing. Adjustable headband conforms to your head for a comfortable fit. Built-in Directional Microphone Amplifies Sounds Under 82dB and Turns Off at 82dB to Help Protect Your Hearing. Automatic Shut Off With Sounds Over 82dB. Low Profile Ear Cups for Firearm Clearance. Adjustable Headband For Comfortable, Secure Fit. Folds Easily for Compact Storage. NRR 24Db. Operates Using 2 - AAA Batteries.