Howard Leight Impact Sport Electronic Earmuff Blue . Loud impulse sounds are effectively blocked out and limited to safe levels. The unique stereo microphones (3) allow detection of the direction of ambient sounds enhancing communication abilities and awareness of surroundings. This earmuff is provided with electrical audio input. Specifications for Howard Leight Impact Sport True Blue Electronic Muff Nr22: Manufacturer: Howard Leight Color: Blue NRR: 22 dB Condition: New Dimensions: 4.60 X 5.85 X 7.55 in Package Contents: Howard Leight Impact Sport True Blue Electronic Muff Nr22 Howard Leight Impact Sport True Blue Electronic Muff Nr22