<br><b>With advanced technology chip,this earmuff will reduce the harmful noise to protect ous health when people work on some noisy environments.<Br>Recommended for shooting, hunting, working, aviation, sawing wood, mowing the lawn, etc<b/> <br>Specifications: <br>Colour: Black, army green, coyote brown,grey (optional) <br>Headset Material: ABS <br>NRR: 22db <br>Head Circumference: ≤70CM <br>Earmuffs Material: gel <br>Horn Type: High fidelity dynamic circle speaker <br>Horn Size: Φ30MM <br>Horn Impedance: 32Ω±15% <br>Horn Frequency Range: 100Hz - 20000Hz <br>Horn SPL: 94±3db (25mw/10mm at 1000Hz) <br>Pickup Function: Yes <br>Pickup Adjustment: increase and reduce / + & - <br>Sound Amplification: Up to 4 times <br>Batteries: 2 x AA batteries (NOT INCLUDED) <br>Service Lift: 5 - 10 years <br>Product Weight: 355g <br>Package Weight: 470g <br>Package include: 1*headphone + 1 user manual