Full Dynamic Range HD Speakers for Clear Bananced Sound Sound Activated Compression Omnidirectional Microphones The original Razor Slim electronic ear muffs feature an ultra-low profile compact design and are available in a variety of color options.? Full dynamic range HD speakers provide clear & balanced sound.? Sound-activated noise compression has a 0.02 second reaction time to protect your hearing no matter the situation.? Razor sets the standard for electronic hearing protection.