Great circuitry teams with a new low-profile design to make these E-Max™ muffs and excellent choice for rifle and shotgun shooters. Action shooters will find them especially useful because the design won't interfere with mounting a gun like some bulkier muffs can. An integrated microphone in each muff amplifies sounds below 85db so that you can hear normal conversation, range commands and ambient sounds normally in stereo. These muffs offer an NRR of 23db to help protect your ears from louder noises. Power is supplied by a pair of AAA batteries (not included).