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Features: 1.Built-in high-precision ANC phase reversal noise reduction circuit,Effectively reduce 85% ambient noise. 2.Noise reduction dedicated 40mm speaker,diaphragm use high-end corona material,fully reflect voice clarity and high quality. 3.Power by 1pcs AAA batteries 4.Two working modes optional,noise reduction mode & normal working mode. 5.Over ear,soft comfortable to wear long time. 6.Foldable design,4 kinds of folding way,easy to carry. 7.With plane plug,Can be used in entertainment systems in the engine room. Specifications: 1.Category: Active noise cancelling headphones 2.Plug: 3.5mm 3.Max output power: 500mW 4.Noise level: 18dB 5.SNR: 90dB 6.Power: Battery(AAA) 7.Rated operating time: 35 hours 8.Noise reduction mode: dual microphone noise feedback Active Noise-Cancelling 9.Speaker Diameter: Ø40mm 10.Impedance: 32Ω 11.Frequency Range: 20Hz - 22KHz 12.Sensitivity: 102dB 13.Cable: 1.5m TPE 14.Microphone: none Product Content: 1.Headphone 2.3.5mm audio cord with Rc function 3.Jack plug adapter(3.5mm/6.3mm) 4.Battery(AAA) x 1pc 5.Portable bag x 1pc 6.Airline adapter x 1pc 7.Instruction/guarantee card