The Walkers Razor Digital Electronic Ear Muff is designed with a new ergonomic headband for comfort and support. It features a powerful NRR rating of 23dB, as well as active dynamic sound suppression for safety at the range. To ensure the preservation of the two AAA batteries; the Digital Razor features an auto shut off at 2, 4, and 6-hour marks. This Hi-Gain Omnidirectional Ear muff captures sound all around you. You can maintain comfortable listening levels with independent volume control. The recessed knob design ensures levels are not changed by accident. Features: