Product Features: Built-in noise reduction circuit inverting precision ANC, it can effectively cut off 90% of the background noise. Dedicated high-quality noise-style 40mm diameter driver unit, to ensure the highest uality. 3.7v lithium ion battery,it was recharged without replacing batteries. two modes of operation, to choose :noise reduction state (subject to a battery), the normal state (without battery) ,it was easy to switch. Earmuffs imported sponge, soft and comfortable, long wear without fatigue. Works with every iPod, mp3 player, CD, portable DVD, PSP, MD,Cellphone and Laptop Enjoy music and movies with clear and lifelike sound No-loss sound connection to your audio device Accommodate your "on the go" style of living. Technical indicators: 1. Category: Active noise canceling headphones 2. the input terminals: DCФ3.5DC Plug 4 3. working voltage: 3.7V 4. the maximum output power: 90MW 5. the noise level :18-20db 6. the signal to noise ratio (SNR): ≥ 90db 7. power supply: 120mA lithium battery 8. Rated operating time:> 20h 9. noise reduction modes: dual-microphone noise feedback 10. Speaker diameter: Ф40mm 11. Speaker Impedance: 32Ω 12. speaker frequency response: 20Hz - 20KHz 13. Speaker sensitivity: 115dB 14. the noise level: ≤-78dBA 15.the dynamic range: ≥ 78 dBA 16. Distortion THD: ≤ 0.1% 17. Stereo crosstalk: ≤ -52 dBA 18. headphone wire length: pvc wire, 1.5M" Package included: 1 x Active Noise Cancelling Headphones 1 x USB charger 1 x 3.5mm Headphone Jack to Air Aircraft Adapter
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