Active Noise Canceling Tactical Headphones Walkers Razor Flat Dark Earth Active Headphones (GWP-RSEM-FDE) are the original Razor Slim electronic headphones featuring an ultra-low profile, compact design. HD speakers with a full dynamic range provide clear and balanced sound. Sound-activated noise compression has a response time of 0.02 seconds to protect your hearing in any situation. Razor sets the standard for electronic hearing protection. 2 omnidirectional microphones with amplification. Full dynamic range hd speakers for clear and balanced sound. Independent volume controls. Noise-absorbing composite housing. Audible compression activation – 0.02 second response time. 23 dB sound reduction. Audio input jack. Volume control knobs. Door for external battery. Works with 2 AAA batteries.