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Electronic Noise Blocking Earmuff

NRR 21dBCut off exceeding 82dBAmplification 8 times to detect the ambient sounds if lower than 50dB1/8in(3.5mm) input jack/plug for portable audio devices such as MP4,Ipod etc.High fidelity stereo soundAdjustable headbandLight weightFoldable headband, easy for storageSoft padded ear cushionIndependent electronic circuit on both cups Powered by 2x1.5v AAA batteries on each cup over 300 hours lifetime(alkaline)Idea for shooter, hunter and worker involved in noisy surrounding

ATTENUATION DATA , NRR

Overall A Weighted Level=81

OSHA Adjusted NRR=21

Frequency HZ	125	250	500	1000	2000	3150	4000	6300	8000
Mean Attenuation(dB).	1.0	15.5	22.2	24.6	33.7	32.4	29	39	39.3
Standard Deviation(dB)	4.3	2.5	2.6	2.6	3.7	2.9	1.9	3.6	3.3

TECHNICAL DATA-Electronic ear defender

Material of headband: Steel strip , PVC coverMaterial of ear cushion: PVC with foam insideMaterial of cup: ABSDimension of earmuff(folding): 11.5*11.5*10cmDimension of inner package: 24.5*15.7*10.5cmWeight of earmuff(batteries excluded):230gWeight of earmuff(batteries included):280gWeight after inner package(batteries excluded):270gWeight after inner package(batteries included):320gBattery type: two AAA batteries each sideBattery lifetime:250-300 hours(alkaline ones)

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