Walker's Cloak Electronic Ear Muff - Thanks to Sound Activated Compression (SAC) and a noise reduction rating (NRR) of 23-25 dB, the Cloak Single Mic Electronic Muffs ensure your hearing is always protected. The addition of built-in, high-definition speakers and a Hi-Gain omnidirectional microphone delivers clear, balanced sounds at safe levels. Simply slide the padded headband into place and go about your business. Easy to fold up and store away in any range bag. Silent, simple-to-operate soft-touch button controls ensure zero distractions. Powered by two AAA batteries (included).