Active Noise Cancelling Headphones, Haina In-Ear Stereo Earbuds with Mic for Sports Running (ANC Noise Reduction Earphones,Noise 4 Hours Reduction Life Time)

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About Active Noise Cancelling Headphones, Haina In-Ear

Life tips: Life 90% of the noise from the low-frequency, active noise reduction headphones can bring a different noise reduction effect 1.Aircraft:The main noise energy spectrum range:20-200Hz. Noise sources:power system noise,aerodynamic noise, structural vibration noise, turbine vibration noise. Noise reduction: 92.1%2.High-speed rail:the main noise energy spectrum range:20-200Hz. Noise sources:wheel and rail noise, aerodynamic noise, building noise, collector system noise, air conditioning noise,two cars meet the wind noise. Noise reduction:92.1%3.Subway:The main noise energy spectrum range:20-200Hz. Noise sources: wheel and rail noise, air conditioning unit noise, traction motor noise, aerodynamic noise, arc noise, building noise. Noise reduction: 92.1%4.Bus:The main noise energy spectrum range: 20-5000HZ. Noise source: noise of the power system, structural vibration noise,wheel noise, wind noise, air conditioning noise,ambient noise Noise reduction:92.1%5. Office:The main noise energy spectrum range:20-400HZ. Noise Source:Air conditioning running noise, office equipment operating noise.Noise reduction: 91.1%