Hunting ear protection EF309

1).NRR:23dB 2).Can adjust the noise reducing sensitivity and suit for any noisy environment. Sensitivity sound controlsystem,reacts/recovers sound onlyneed 1.8milliseconds 3).Control harmful noise levels to kept within 75dB. If Sounds below 70dB can be amplified up to 8X times normal hearing to 50dB 4). Each ear cups is equipped with its own electronics circuit,the sound reception is stereophonic, with maintained directional sound. 5).Use a single AAA battery on each side 6)Packaging: color box,plastic blister card,leather bag,cotton bag