Rubberized coating: It is engineered with ultra-low profile ear cups with rubberized coating Audio inputjack: Equipped with full dynamic range HD speakers for clear balanced sound, it also comes with an audio input jack Noise reduction rating (NRR): Delivering an impressive Noise Reduction Rating (NRR) of 23 dB, this muff is sure to protect your hearing, without interfering Bundle Includes: Walker's Razor Slim Electronic Shooting Muff (American Flag), Hearing Protection and Safety Glasses Case, and Ballistic Protection Glasses (Clear) Sound quality: The Razor Slim Muff features sound dampening composite housing for providing smoother and suppressed sound quality. It is frequency tuned for natural sound clarity and also features sound activated compression, which will start after 0