Protect Your Ears with Walker's Shoot all day and never miss a word with the Walkers Razor X-TRM electronic muffs! These muffs will amplify normal conversation allowing you to hear an instructor or carry on a conversation with a friend. Once a gun shot goes off they will automatically cut out long enough to protect your hearing but no so long that you can no longer have a conversation. Item Specifications and Features: Walker's GWP-XRSEM Ultra low-profile design Cool Mesh Headband Comfort GEL Earpads Rubberized Coating Two Hi Gain Omni Directional Microphones Audio Input Jack Low Noise / Frequency tuned for natural sound clarity Volume Control Compact Folding Design Comfort headband w/ metal wire frame NRR 21 Sound Activated Compression Recessed Volume Control Knob External Battery Door Operates on 2 "AAA" batteries included Black