Hearing Enhancement and Protection. Adjustable Frequency Tuning (AFT) allows shooters who prefer muffs to now tune in specific sound frequencies and custom set their Walker"s Power Muffs to match their individual hearing needs, while protecting them from the harmful affects of muzzle blasts. 4 independent high grequency microphones. Shooting safety is first and foremost at Walker"s. For those who prefer muffs-style hearing enhancement and protection, we have incorporated the same technology and components found in our #1 selling Game Ear II into our Walker"s Power Muffs.