Impact Sport Bolt Digital Electronic Shooting Earmuff Gray. Synthetic Imported LIGHTNING-FAST ATTACK TIME: Digital compression circuitry offers a. 5 millisecond attack time (250X faster than the classic Impact Sport) to compress any noise that exceeds a safe 82 dB; NRR 22 5X SOUND AMPLIFICATION: Enhances low level frequencies like range commands, conversation with fellow shooters and animal noises; ideal for indoor & outdoor shooting, and hunting in the field RECESSED MICROPHONES: Reduces wind noise while providing clear, directional sound; allows the user to easily identify a sound’s origin which is a great benefit to hunters in the field SLIM DESIGN: Low profile earcup with rifle cutaways for gun stock clearance allow use in any shooting environment; adjustable, padded headband for comfort; folds for easy storage; water-resistant INCLUDES: Belt clip, extra earcup cushions, 2 AAA batteries, AUX input and 3.5 mm connection cord for MP3s and scanners; 4-hour auto shut-off increases battery life approx.