GBP 57 SIGNS AND LABELS. FOR MORE SAFETY AT WORK! Signs and labels from page 488. Howard Leight™ Impact® Pro Industrial ​ Ear defenders with powerful electronics and high attenuation across all frequency ranges. The two stereo microphones amplify the environmental noises, but reliably block noises in excess of 82 dB that are harmful to health. Volume control and connection option for MP3 player and smartphone (combines hearing protection and headphones, no call function). SNR = 30dB (H = 33dB, M = 27dB, L = 20dB). Standard: EN 352-4 Supplied with: With 2 AAA batteries. Type IND Ear defenders, dependent on noise levels 09 7769 09A eShop Howard Leight™ Impact® Pro Industrial SNR value (noise attenuation) dB(A) 30 Working time h 50 ​ 09 7769 Weight g 372 88