Neiko RIDGE53865A Impact Sport Ear Protector ANSI S3.19 Safety Electronic Earmuffs Built in microphone safely reduces any sounds above 85 dB for a natural listening On and off volume knob is easy to adjust for quick sound tuning Easily power your ear muff on and off with the LED indicator light Adjustable head band and padded ear cups allow you to have the most comfortable fit Conveniently operates on 2 AA alkaline batteries (included)